FADEC Full Authority Digital Engine Control, a computer that monitors jet-engine performance and pilot-throttle inputs and regulates fuel supply for maximum efficiency. Full Authority Digital Engine Control, a computer that monitors jet-engine performance and pilot-throttle inputs and regulates fuel supply for maximum efficiency.

Flameout Unintended loss of combustion inside a jet engine, due to a disruption of airflow. This can be extremely serious if the flight crew is unable to restart the affected engine. Unintended loss of combustion inside a jet engine, due to a disruption of airflow. This can be extremely serious if the flight crew is unable to restart the affected engine.

Flap A hinged control surface, usually on the trailing edge of a wing, commonly used to increase lift during takeoff and drag during landing. A hinged control surface, usually on the trailing edge of a wing, commonly used to increase lift during takeoff and drag during landing.

Flare (1). A pyrotechnic device ejected by an aircraft as a countermeasure to heat-seeking missiles. (2). A pitch-up maneuver to bleed off energy performed during landing, just before touching down. (1). A pyrotechnic device ejected by an aircraft as a countermeasure to heat-seeking missiles. (2). A pitch-up maneuver to bleed off energy performed during landing, just before touching down.

FLIR Forward Looking Infrared: an electro-optical device similar to a television camera that "sees" in the infrared spectrum rather than visible light. FLIRs display an image based on minute temperature variations, so that hot engine exhaust ducts, for example, appear as bright spots. Forward Looking Infrared: an electro-optical device similar to a television camera that "sees" in the infrared spectrum rather than visible light. FLIRs display an image based on minute temperature variations, so that hot engine exhaust ducts, for example, appear as bright spots.

G-Force One G is the force exerted by Earth's gravity on stationary objects at sea level. High-energy maneuvers can subject the aircraft and pilot to as much as 9 Gs. Some advanced missiles can pull as much as 60 Gs in a turn. One G is the force exerted by Earth's gravity on stationary objects at sea level. High-energy maneuvers can subject the aircraft and pilot to as much as 9 Gs. Some advanced missiles can pull as much as 60 Gs in a turn.

GBU Guided Bomb Unit. General U.S. term for precision-guided munitions. Guided Bomb Unit. General U.S. term for precision-guided munitions.

GBU-29/30/31/32 JDAM Joint Direct Attack Munition. A general-purpose bomb or penetration warhead, with inertial/GPS guidance package in the tail cone. Initial operational capability planned for 1999. Navy requirement is 12,000 bombs; Air Force requirement is for 62,000. Joint Direct Attack Munition. A general-purpose bomb or penetration warhead, with inertial/GPS guidance package in the tail cone. Initial operational capability planned for 1999. Navy requirement is 12,000 bombs; Air Force requirement is for 62,000.

Geosynchronous Also called "geostationary." A satellite in equatorial orbit at an alt.i.tude of 35,786 km (about 22,230 miles) will take 24 hours to circle the Earth. In 24 hours the Earth rotates once on its axis, so the satellite will appear to be "fixed" over the same point on the earth. Also called "geostationary." A satellite in equatorial orbit at an alt.i.tude of 35,786 km (about 22,230 miles) will take 24 hours to circle the Earth. In 24 hours the Earth rotates once on its axis, so the satellite will appear to be "fixed" over the same point on the earth.

"Gla.s.s" c.o.c.kpit Design that replaces individual flight gauges and instruments with multi-function electronic display screens. A few mechanical gauges are usually retained for emergency backup. Design that replaces individual flight gauges and instruments with multi-function electronic display screens. A few mechanical gauges are usually retained for emergency backup.

Goldwater-Nichols Common name for the Military Reform Act of 1986, which created a series of Unified Commands cutting across traditional service boundaries and strengthened the power of the Chairman of the Joint Chiefs of Staff. Common name for the Military Reform Act of 1986, which created a series of Unified Commands cutting across traditional service boundaries and strengthened the power of the Chairman of the Joint Chiefs of Staff.

GPS Global Positioning System. A constellation of 24 satellites in inclined earth orbits, which continuously broadcast navigational signals synchronized by ultra-precise atomic clocks. At least four satellites are usually in transit across the sky visible from any point on Earth outside the Polar Regions. A specialized computer built into a portable receiver can derive highly accurate position and velocity information by correlating data from three or more satellites. An encoded part of the signal is reserved for military use. A similar, incomplete, Russian system is called GLONa.s.s. Global Positioning System. A constellation of 24 satellites in inclined earth orbits, which continuously broadcast navigational signals synchronized by ultra-precise atomic clocks. At least four satellites are usually in transit across the sky visible from any point on Earth outside the Polar Regions. A specialized computer built into a portable receiver can derive highly accurate position and velocity information by correlating data from three or more satellites. An encoded part of the signal is reserved for military use. A similar, incomplete, Russian system is called GLONa.s.s.

HARM AGM-88 High Speed Anti-Radiation Missile, produced by Texas Instruments. Mach 2+. 146-1b blast-fragmentation warhead. Typically fired 35 to 55 miles from target, but maximum range is greater. First used in combat in April 1986 raid on Libya; 40 missiles fired. AGM-88 High Speed Anti-Radiation Missile, produced by Texas Instruments. Mach 2+. 146-1b blast-fragmentation warhead. Typically fired 35 to 55 miles from target, but maximum range is greater. First used in combat in April 1986 raid on Libya; 40 missiles fired.

Have Blue Original Lockheed "Skunk Works" prototype for the F-117 Stealth fighter. Considerably smaller than the production aircraft, and still highly cla.s.sified. Original Lockheed "Skunk Works" prototype for the F-117 Stealth fighter. Considerably smaller than the production aircraft, and still highly cla.s.sified.

HEI High Explosive Incendiary, a type of ammunition commonly used with air-to-air guns. High Explosive Incendiary, a type of ammunition commonly used with air-to-air guns.

HOTAS Hands on Throttle and Stick. A c.o.c.kpit flight control unit that allows the pilot to regulate engine power settings and steering commands with one hand. Hands on Throttle and Stick. A c.o.c.kpit flight control unit that allows the pilot to regulate engine power settings and steering commands with one hand.

HS Helicopter Antisubmarine Squadron. Helicopter Antisubmarine Squadron.

HSL Helicopter Antisubmarine Squadron, Light. Helicopter Antisubmarine Squadron, Light.

HUD Heads-Up Display: a transparent screen above the c.o.c.kpit instruments on which critical flight, target, and weapons information is projected, so that the pilot need not look down to read gauges and displays during an engagement. Current HUD technology provides wide-angle display of radar and sensor data. Heads-Up Display: a transparent screen above the c.o.c.kpit instruments on which critical flight, target, and weapons information is projected, so that the pilot need not look down to read gauges and displays during an engagement. Current HUD technology provides wide-angle display of radar and sensor data.

IIR Imaging Infrared. An electro-optical device similar to a video camera that "sees" small differences in temperature and displays them as levels of contrast or false colors on a operator's display screen. Imaging Infrared. An electro-optical device similar to a video camera that "sees" small differences in temperature and displays them as levels of contrast or false colors on a operator's display screen.

ILS Instrument Landing System. A radio-frequency device installed at some airfields that a.s.sists the pilot of a suitably equipped aircraft in landing during conditions of poor visibility. Instrument Landing System. A radio-frequency device installed at some airfields that a.s.sists the pilot of a suitably equipped aircraft in landing during conditions of poor visibility.

INS Inertial Navigation System. A device that determines location and velocity by sensing the acceleration and direction of every movement since the system was initialized or updated at a known point. Conventional INS systems using mechanical gyroscopes are subject to "drift" after hours of continuous operation. Ring-laser gyros sense motion by measuring the frequency shift of laser pulses in two counter-rotating rings, and are much more accurate. The advantage of an INS is that it requires no external transmission to determine location. Inertial Navigation System. A device that determines location and velocity by sensing the acceleration and direction of every movement since the system was initialized or updated at a known point. Conventional INS systems using mechanical gyroscopes are subject to "drift" after hours of continuous operation. Ring-laser gyros sense motion by measuring the frequency shift of laser pulses in two counter-rotating rings, and are much more accurate. The advantage of an INS is that it requires no external transmission to determine location.

Interdiction Use of airpower to disrupt or prevent the movement of enemy military units and supplies by attacking transportation routes, vehicles, and bridges deep in the enemy rear. Use of airpower to disrupt or prevent the movement of enemy military units and supplies by attacking transportation routes, vehicles, and bridges deep in the enemy rear.

IOC Initial Operational Capability. The point in the life cycle of a weapon system when it officially enters service and is considered ready for combat, with all training, spare parts, technical manuals, and software complete. The more complex the system, the greater the chance that the originally scheduled IOC will slip. Initial Operational Capability. The point in the life cycle of a weapon system when it officially enters service and is considered ready for combat, with all training, spare parts, technical manuals, and software complete. The more complex the system, the greater the chance that the originally scheduled IOC will slip.

IRBM Intermediate Range Ballistic Missile. A rocket (typically two-stage) designed to deliver a warhead over regional rather than intercontinental distances. This cla.s.s of weapons was eliminated by treaty and obsolescence from U.S. and Russian strategic forces, but is rapidly proliferating in various world trouble spots, despite international efforts to limit the export of ballistic missile technologies. Intermediate Range Ballistic Missile. A rocket (typically two-stage) designed to deliver a warhead over regional rather than intercontinental distances. This cla.s.s of weapons was eliminated by treaty and obsolescence from U.S. and Russian strategic forces, but is rapidly proliferating in various world trouble spots, despite international efforts to limit the export of ballistic missile technologies.

JCS Joint Chiefs of Staff. The senior U.S. military command level, responsible for advising the President on matters of national defense. The JCS consists of a Chairman, who may be drawn from any service, the Chief of Naval Operations, the Chief of Staff of the Army, the Commandant of the Marine Corps, and the Chief of Staff of the Air Force. Joint Chiefs of Staff. The senior U.S. military command level, responsible for advising the President on matters of national defense. The JCS consists of a Chairman, who may be drawn from any service, the Chief of Naval Operations, the Chief of Staff of the Army, the Commandant of the Marine Corps, and the Chief of Staff of the Air Force. JFACC JFACC Joint Forces Air Component Commander. The officer who has operational control over all air units and air a.s.sets a.s.signed to a theater of operations. The JFACC is typically drawn from the service that has the greatest amount of airpower in the area of operations, and reports directly to the theater Commander in Chief. Joint Forces Air Component Commander. The officer who has operational control over all air units and air a.s.sets a.s.signed to a theater of operations. The JFACC is typically drawn from the service that has the greatest amount of airpower in the area of operations, and reports directly to the theater Commander in Chief.

JP-5 Standard U.S. jet fuel. A petroleum distillate similar to kerosene. Standard U.S. jet fuel. A petroleum distillate similar to kerosene.

JTF Joint Task Force: a military unit composed of elements of two or more services, commanded by a relatively senior officer. JTFs may be organized for a specific mission, or maintained as semi-permanent organizations, such as the anti-drug JTF-4 based in Florida. Joint Task Force: a military unit composed of elements of two or more services, commanded by a relatively senior officer. JTFs may be organized for a specific mission, or maintained as semi-permanent organizations, such as the anti-drug JTF-4 based in Florida.

KC-10 Extender Heavy tanker/transport based on Boeing DC-10 wide-body commercial airliner. 59 aircraft in service, some modified with drogue refueling hose reel as well as tail boom. Three CF6 turbofan engines. Maximum takeoff weight is 590,000 lbs. Heavy tanker/transport based on Boeing DC-10 wide-body commercial airliner. 59 aircraft in service, some modified with drogue refueling hose reel as well as tail boom. Three CF6 turbofan engines. Maximum takeoff weight is 590,000 lbs.

KC-130 Lockheed "Hercules" four-engine turboprop, used as a transport and aerial tanker by Marine air units. Lockheed "Hercules" four-engine turboprop, used as a transport and aerial tanker by Marine air units.

Knot Nautical miles (6,076 feet) per hour. Often used by U.S. Air Force and Navy to measure aircraft speeds, particular in the subsonic range. One knot equals one nautical mile per hour. Nautical miles (6,076 feet) per hour. Often used by U.S. Air Force and Navy to measure aircraft speeds, particular in the subsonic range. One knot equals one nautical mile per hour.

LGB Laser-guided bomb, such as the Paveway-series LGBs produced by Raytheon. Laser-guided bomb, such as the Paveway-series LGBs produced by Raytheon.

LHA Large amphibious a.s.sault ship designed to operate helicopters and STOVL aircraft, with a well deck for landing craft.

LHD Amphibious a.s.sault ship with flight deck and well deck. Amphibious a.s.sault ship with flight deck and well deck.

LPD Amphibious ship with well deck. Amphibious ship with well deck.

LPH Amphibious a.s.sault ship designed to operate helicopters. Amphibious a.s.sault ship designed to operate helicopters.

LRIP Low Rate Initial Production. A phase in the development of a new weapon system in which the "bugs" are worked out of manufacturing techniques, tooling, and doc.u.mentation before shifting to full-rate production. Low Rate Initial Production. A phase in the development of a new weapon system in which the "bugs" are worked out of manufacturing techniques, tooling, and doc.u.mentation before shifting to full-rate production.

LSD Amphibious landing dockship. Amphibious landing dockship.

M-61 Vulcan Six-barreled rotary ("Gatling") 20mm cannon used as standard weapon on U.S. aircraft. Very high rate of fire. Also mounted on Army vehicles and Navy ships for short-range antiaircraft defense. Six-barreled rotary ("Gatling") 20mm cannon used as standard weapon on U.S. aircraft. Very high rate of fire. Also mounted on Army vehicles and Navy ships for short-range antiaircraft defense.

Mach The speed of sound at sea level (760 feet per second). An aircraft's Mach number is dependent on alt.i.tude, since sound travels faster in a denser medium. Named for Ernst Mach (1838-1916), Austrian physicist.

MAG Marine Aircraft Group. Marine Aircraft Group.

MAGTF Marine Air-Ground Task Force. Marine Air-Ground Task Force.

MAW Marine Aircraft Wing. Marine Aircraft Wing.

MCAS Marine Corps Air Station. Marine Corps Air Station.

MEB Marine Expeditionary Brigade. Marine Expeditionary Brigade.

MEF Marine Expeditionary Force. Marine Expeditionary Force.

MEU Marine Expeditionary Unit. Marine Expeditionary Unit.

MEU (SOC) Marine Expeditionary Unit (Special Operations Capable). Marine Expeditionary Unit (Special Operations Capable).

MFD Multi-function Display. A small video monitor or flat panel display on an aircraft control panel that allows the operator to display and manipulate different kinds of sensor information, status indications, warnings, and system diagnostic data. Multi-function Display. A small video monitor or flat panel display on an aircraft control panel that allows the operator to display and manipulate different kinds of sensor information, status indications, warnings, and system diagnostic data.

MiG Russian acronym for the Mikoyan-Gurevich Design Bureau, developers of some of the greatest fighter aircraft in history. Survived the breakup of the Soviet Union, and is actively competing in the global arms market. Russian acronym for the Mikoyan-Gurevich Design Bureau, developers of some of the greatest fighter aircraft in history. Survived the breakup of the Soviet Union, and is actively competing in the global arms market.

MOS Military Occupational Specialty. Military Occupational Specialty.

MPF Maritime Prepositioning Force. Maritime Prepositioning Force.

MPS Maritime Prepositioning Ship. Maritime Prepositioning Ship.

MPSRON Maritime Prepositioning Ship Squadron. Maritime Prepositioning Ship Squadron.

MRC Major Regional Contingency Pentagon euphemism for small war or large crisis requiring a significant intervention of U.S. military forces as directed by the President. Major Regional Contingency Pentagon euphemism for small war or large crisis requiring a significant intervention of U.S. military forces as directed by the President.

MRE Meals, Ready to Eat. Military field ration in individual serving packs. Eaten by Marines on deployment until regular dining facilities can be constructed. Humorously known as "Meals Rejected by Everyone." Meals, Ready to Eat. Military field ration in individual serving packs. Eaten by Marines on deployment until regular dining facilities can be constructed. Humorously known as "Meals Rejected by Everyone."

NAF Naval Air Facility (typically a smaller base than a Naval Air Station). Naval Air Facility (typically a smaller base than a Naval Air Station).

NAS Naval Air Station. Naval Air Station.

Nautical Mile (nm) 6,076 feet. Not to be confused with Statute Mile, of 5,280 feet. 6,076 feet. Not to be confused with Statute Mile, of 5,280 feet.

NAVAIR Naval Air Systems Command. Organization that procures and manages aircraft and related systems and equipment for the Navy and Marine Corps. Formerly called Bureau of Aeronautics (BuAir) Naval Air Systems Command. Organization that procures and manages aircraft and related systems and equipment for the Navy and Marine Corps. Formerly called Bureau of Aeronautics (BuAir) NAVSEA Naval Sea Systems Command. Organization that procures and manages ships and related systems for the Navy. Formerly called Bureau of Ships (BuShips). Naval Sea Systems Command. Organization that procures and manages ships and related systems for the Navy. Formerly called Bureau of Ships (BuShips).

NBC Nuclear-Biological-Chemical. General term for weapons of ma.s.s destruction, including nuclear bombs or weapons designed to disperse radioactive material, toxic gases, liquids, or powders, infectious microorganisms or biological toxins. Forbidden by many international treaties that have been widely ignored. Nuclear-Biological-Chemical. General term for weapons of ma.s.s destruction, including nuclear bombs or weapons designed to disperse radioactive material, toxic gases, liquids, or powders, infectious microorganisms or biological toxins. Forbidden by many international treaties that have been widely ignored.

NCO Non-Commissioned Officer. An enlisted soldier, sailor, or airman with supervisory responsibility or technical qualifications. There are nine standardized enlisted pay grades, but each service has its own complex nomenclature for NCO ranks. In the navy these are petty officer, chief petty officer, senior chief petty officer, and master chief petty officer. The senior NCO on a vessel, regardless of rank, is informally known as "Command Master Chief." Non-Commissioned Officer. An enlisted soldier, sailor, or airman with supervisory responsibility or technical qualifications. There are nine standardized enlisted pay grades, but each service has its own complex nomenclature for NCO ranks. In the navy these are petty officer, chief petty officer, senior chief petty officer, and master chief petty officer. The senior NCO on a vessel, regardless of rank, is informally known as "Command Master Chief."

NEO Non-combatant Evacuation Operations. Use of military force to rescue American and foreign citizens, diplomatic personnel, and relief workers endangered by civil unrest or factional fighting. Non-combatant Evacuation Operations. Use of military force to rescue American and foreign citizens, diplomatic personnel, and relief workers endangered by civil unrest or factional fighting.

NORAD North American Air Defense Command. Joint U.S.-Canadian headquarters located inside Cheyenne Mountain, CO, responsible for air defense of North America. CINCNORAD is also the Commander of U.S. s.p.a.ce Command. North American Air Defense Command. Joint U.S.-Canadian headquarters located inside Cheyenne Mountain, CO, responsible for air defense of North America. CINCNORAD is also the Commander of U.S. s.p.a.ce Command.

NRO National Reconnaissance Office. Formerly super-secret intelligence agency established in early 1960's within the Department of Defense. Not officially acknowledged to exist until 1990's. Responsible for procurement, operation, and management of various types of reconnaissance satellites. A separate organization, the Central Imagery Office, is responsible for processing, interpretation, and dissemination of satellite imagery. National Reconnaissance Office. Formerly super-secret intelligence agency established in early 1960's within the Department of Defense. Not officially acknowledged to exist until 1990's. Responsible for procurement, operation, and management of various types of reconnaissance satellites. A separate organization, the Central Imagery Office, is responsible for processing, interpretation, and dissemination of satellite imagery.

NS Naval Station, typically a larger base that includes sh.o.r.e facilities, airfields, and logistic installations. Naval Station, typically a larger base that includes sh.o.r.e facilities, airfields, and logistic installations.

"Nugget" Pilot jargon for an inexperienced aviator, or new person in the squadron. Pilot jargon for an inexperienced aviator, or new person in the squadron.

O&M Operations and Maintenance. A major budget item for all military units. Operations and Maintenance. A major budget item for all military units.

OpTempo Operational tempo-subjective measure of the intensity of military operations. In combat high OpTempos can overwhelm the enemy's ability to respond, at the risk of burning out your own forces. In peacetime a high OpTempo can adversely affect morale and exhaust budgeted funds. Operational tempo-subjective measure of the intensity of military operations. In combat high OpTempos can overwhelm the enemy's ability to respond, at the risk of burning out your own forces. In peacetime a high OpTempo can adversely affect morale and exhaust budgeted funds.

Ordnance Weapons, ammunition, or other consumable armament. Frequently misspelled. Weapons, ammunition, or other consumable armament. Frequently misspelled.

OTH Over the Horizon. Used in references to sensors and targeting. Distance to the visual horizon may be 20 miles from the masthead of a ship, or more than 200 miles from an aircraft at high alt.i.tude. Over the Horizon. Used in references to sensors and targeting. Distance to the visual horizon may be 20 miles from the masthead of a ship, or more than 200 miles from an aircraft at high alt.i.tude.

PAA Primary Aircraft Authorized-the number of planes allocated to a unit for the performance of its operational mission. PAA is the basis for budgeting manpower, support equipment, and flying hours. In some cases, a unit may have fewer aircraft because of delivery schedule slippage or accidents. Units may also have more aircraft than their PAA, such as trainers, spare "maintenance floats," or inoperable "hangar queens." Primary Aircraft Authorized-the number of planes allocated to a unit for the performance of its operational mission. PAA is the basis for budgeting manpower, support equipment, and flying hours. In some cases, a unit may have fewer aircraft because of delivery schedule slippage or accidents. Units may also have more aircraft than their PAA, such as trainers, spare "maintenance floats," or inoperable "hangar queens."

PAO Public Affairs Officer. Military staff officer responsible for media relations, coordination with civil authorities, VIP escort duties, and similar ch.o.r.es. The PAO of an aircraft carrier is typically a Navy lieutenant, supervising a small team of enlisted writers and media specialists. Public Affairs Officer. Military staff officer responsible for media relations, coordination with civil authorities, VIP escort duties, and similar ch.o.r.es. The PAO of an aircraft carrier is typically a Navy lieutenant, supervising a small team of enlisted writers and media specialists.

Paveway Generic term for laser-guided bombs. Made by Raytheon/Texas Instruments since 1968. Latest Paveway III version provides standoff range of 3-5 nm. Generic term for laser-guided bombs. Made by Raytheon/Texas Instruments since 1968. Latest Paveway III version provides standoff range of 3-5 nm.

PGM Precision Guided Munition. Commonly called a "smart bomb," any weapon that uses electronic, electro-optical, inertial, or other advanced forms of terminal guidance to achieve a very high probability of hitting its target. Precision Guided Munition. Commonly called a "smart bomb," any weapon that uses electronic, electro-optical, inertial, or other advanced forms of terminal guidance to achieve a very high probability of hitting its target.

Pitch Change of an aircraft's att.i.tude relative to its lateral axis (a line drawn from left to right through the center of gravity). Pitch up and the nose rises; pitch down and the nose drops. Change of an aircraft's att.i.tude relative to its lateral axis (a line drawn from left to right through the center of gravity). Pitch up and the nose rises; pitch down and the nose drops.

"Pucker Factor" Flight crew anxiety level. Typically related to highly stressful combat situations such as major aircraft system malfunctions while under fire from enemy missiles. Flight crew anxiety level. Typically related to highly stressful combat situations such as major aircraft system malfunctions while under fire from enemy missiles.

Pylon A structure attached to the wing or fuselage of an aircraft that supports an engine, fuel tank, weapon, or external pod. The pylon itself may be removable, in which case it is attached to a "hard point" that provides a mechanical and electrical interface. A structure attached to the wing or fuselage of an aircraft that supports an engine, fuel tank, weapon, or external pod. The pylon itself may be removable, in which case it is attached to a "hard point" that provides a mechanical and electrical interface.

RAM Radar Absorbing Material. Metal or metal-oxide particles or fibers embedded in synthetic resin applied as a coating or surface treatment on radar-reflective areas of a vehicle in order to reduce its radar cross Radar Absorbing Material. Metal or metal-oxide particles or fibers embedded in synthetic resin applied as a coating or surface treatment on radar-reflective areas of a vehicle in order to reduce its radar cross

section. A particular RAM formulation may be specific to a narrow band of the radar frequency spectrum.

RC-135V Rivet Joint Program name for electronic reconnaissance aircraft, operated by 55th Wing based at Offut AFB, NE. Used in Saudi Arabia during Desert Shield/Desert Storm. Program name for electronic reconnaissance aircraft, operated by 55th Wing based at Offut AFB, NE. Used in Saudi Arabia during Desert Shield/Desert Storm.

RH-53E Sikorsky "Sea Dragon" found in mine-countermeasure units. Sikorsky "Sea Dragon" found in mine-countermeasure units.

RIM-116A RAM RIM-116A Rolling Airframe Missile. Development began in 1975 as a joint U.S./German/Danish program. Entered service in June 1993 on USS Peleliu (LHA-5). Combines seeker head of Stinger SAM with motor, warhead, and fuse from AIM-9 Sidewinder. Angled tail fins cause the missile to spin in flight for stability. Range of around 5 nm, and carried in a 21-round box launcher. RIM-116A Rolling Airframe Missile. Development began in 1975 as a joint U.S./German/Danish program. Entered service in June 1993 on USS Peleliu (LHA-5). Combines seeker head of Stinger SAM with motor, warhead, and fuse from AIM-9 Sidewinder. Angled tail fins cause the missile to spin in flight for stability. Range of around 5 nm, and carried in a 21-round box launcher.

RO-RO Roll-on/Roll-off. A cargo ship with vehicle parking decks, flexible ramps, and special ventilation, allowing loaded vehicles to drive on or off under their own power. Roll-on/Roll-off. A cargo ship with vehicle parking decks, flexible ramps, and special ventilation, allowing loaded vehicles to drive on or off under their own power.

ROE Rules of Engagement. Guidance often determined at the highest levels of national government, regarding how and when warriors may employ their weapons. In air-to-air combat, ROE usually specify specific criteria for declaring a non-friendly aircraft as hostile. In air-to-ground combat, ROE usually forbids attacking targets likely to involve significant collateral damage to civilian populations or religious sites. Regardless of the ROE, the right of self-defense against direct armed attack is Rules of Engagement. Guidance often determined at the highest levels of national government, regarding how and when warriors may employ their weapons. In air-to-air combat, ROE usually specify specific criteria for declaring a non-friendly aircraft as hostile. In air-to-ground combat, ROE usually forbids attacking targets likely to involve significant collateral damage to civilian populations or religious sites. Regardless of the ROE, the right of self-defense against direct armed attack is never never denied. denied.

Roll Change of att.i.tude relative to the longitudinal axis (a line drawn from nose to tail through the center of gravity). Roll to port and an aircraft tilts to the left; roll to starboard and it tilts to the right. Roll also describes a cla.s.s of aerobatic maneuvers, such as the barrel roll. Change of att.i.tude relative to the longitudinal axis (a line drawn from nose to tail through the center of gravity). Roll to port and an aircraft tilts to the left; roll to starboard and it tilts to the right. Roll also describes a cla.s.s of aerobatic maneuvers, such as the barrel roll.

RWR Radar Warning Receiver. An electronic detector tuned to one or more hostile radar frequencies and linked to an alarm that alerts the pilot to the approximate direction, and possibly the type of threat. Similar in concept to automotive police radar detectors. Also known as a RHAW (Radar Homing and Warning Receiver). Radar Warning Receiver. An electronic detector tuned to one or more hostile radar frequencies and linked to an alarm that alerts the pilot to the approximate direction, and possibly the type of threat. Similar in concept to automotive police radar detectors. Also known as a RHAW (Radar Homing and Warning Receiver).

SAM Surface to Air Missile. A guided missile with the primary mission of engaging and destroying enemy aircraft. Most SAMs use rocket propulsion and some type of radar or infrared guidance. Surface to Air Missile. A guided missile with the primary mission of engaging and destroying enemy aircraft. Most SAMs use rocket propulsion and some type of radar or infrared guidance.

SAR Synthetic Aperture Radar. An aircraft radar (or operating mode of a multi-function radar) that can produce highly accurate ground maps. Synthetic Aperture Radar. An aircraft radar (or operating mode of a multi-function radar) that can produce highly accurate ground maps.

SCUD Western reporting name for the Soviet R-11 (SCUD-A) and R-17 (SCUD-B) short-range ballistic missiles. Based largely on captured WW II German technology. Range of 110-180 miles with 900-kg/1,980-1b warhead, with inaccurate inertial guidance. Can be transported and erected for launch by a large truck. Widely exported to Iraq, North Korea, and other Soviet client states. Iraq modified basic SCUD-B design to produce longer-ranged Al Abbas and Al Hussein missiles with much smaller warheads. Western reporting name for the Soviet R-11 (SCUD-A) and R-17 (SCUD-B) short-range ballistic missiles. Based largely on captured WW II German technology. Range of 110-180 miles with 900-kg/1,980-1b warhead, with inaccurate inertial guidance. Can be transported and erected for launch by a large truck. Widely exported to Iraq, North Korea, and other Soviet client states. Iraq modified basic SCUD-B design to produce longer-ranged Al Abbas and Al Hussein missiles with much smaller warheads.

SEAD Suppression of Enemy Air Defenses. This requires enticing the enemy to "light up" search and tracking radars, launch SAMs, or fire antiaircraft guns, which can then be targeted for destruction or neutralization by jamming and other countermeasures. Suppression of Enemy Air Defenses. This requires enticing the enemy to "light up" search and tracking radars, launch SAMs, or fire antiaircraft guns, which can then be targeted for destruction or neutralization by jamming and other countermeasures.

SIGINT Signal Intelligence. Interception, decoding, and a.n.a.lysis of enemy communications traffic. Signal Intelligence. Interception, decoding, and a.n.a.lysis of enemy communications traffic.

Skunk Works Lockheed's Burbank, California, Advanced Development group, created during WW II by engineer Clarence "Kelly" Johnson. Developed the U-2, SR-71, F-117, and other secret aircraft. Lockheed Martin copyrights the name and skunk cartoon logo. Lockheed's Burbank, California, Advanced Development group, created during WW II by engineer Clarence "Kelly" Johnson. Developed the U-2, SR-71, F-117, and other secret aircraft. Lockheed Martin copyrights the name and skunk cartoon logo.

Slat A long, narrow, moveable control surface, usually along the leading edge of the wing, to provide additional life during takeoff. A long, narrow, moveable control surface, usually along the leading edge of the wing, to provide additional life during takeoff.

Sortie The basic unit of airpower: one complete combat mission by one aircraft. "Sortie generation" is the ability of an air unit to re-arm, refuel, and service aircraft for repeated missions in a given period. The basic unit of airpower: one complete combat mission by one aircraft. "Sortie generation" is the ability of an air unit to re-arm, refuel, and service aircraft for repeated missions in a given period.

Sparrow AIM-7 family of long-range radar-guided air-to-air missiles produced by Raytheon. Variants include the ship-launched Sea Sparrow. AIM-7 family of long-range radar-guided air-to-air missiles produced by Raytheon. Variants include the ship-launched Sea Sparrow.

Stall Sudden lost of lift when the airflow separates from the wing surface; may be caused by a variety of maneuvers, such as climbing too steeply with insufficient thrust. "Compressor stall" is a different phenomenon that occurs inside a turbine engine. Sudden lost of lift when the airflow separates from the wing surface; may be caused by a variety of maneuvers, such as climbing too steeply with insufficient thrust. "Compressor stall" is a different phenomenon that occurs inside a turbine engine.

Stealth A combination of design features, technologies, and materials, some highly cla.s.sified, designed to reduce the radar, visual, infrared, and acoustic signature of an aircraft, ship, or other vehicle. This can be taken to the point where effective enemy detection and countermeasures are extremely unlikely before the vehicle has completed its mission and escaped. The F-117A is the best-known modern example. A combination of design features, technologies, and materials, some highly cla.s.sified, designed to reduce the radar, visual, infrared, and acoustic signature of an aircraft, ship, or other vehicle. This can be taken to the point where effective enemy detection and countermeasures are extremely unlikely before the vehicle has completed its mission and escaped. The F-117A is the best-known modern example.