The GBU-12 Paveway II is an American aerial

laser-guided bomb A laser-guided bomb (LGB) is a guided bomb that uses semi-active laser guidance to strike a designated target with greater accuracy than an unguided bomb. First developed by the United States during the Vietnam War, laser-guided bombs quickly pr ...

, based on the

Mk 82 The Mark 82 (Mk 82) is an unguided, low- drag general-purpose bomb, part of the United States Mark 80 series. The explosive filling is usually tritonal, though other compositions have sometimes been used. Development and deployment Wi ...

500-pound (227 kg)

general-purpose bomb A general-purpose bomb is an air-dropped bomb intended as a compromise between blast damage, penetration, and fragmentation in explosive effect. They are designed to be effective against enemy troops, vehicles, and buildings. Characteristics ...

, but with the addition of a nose-mounted laser seeker and fins for guidance. A member of the

Paveway Paveway is a series of laser-guided bombs (LGBs). ''Pave'' or PAVE is sometimes used as an acronym for ''precision avionics vectoring equipment''; literally, electronics for controlling the speed and direction of aircraft. Laser guidance is ...

series of weapons, Paveway II entered into service c.

1976 Events January * January 3 – The International Covenant on Economic, Social and Cultural Rights enters into force. * January 5 – The Pol Pot regime proclaims a new constitution for Democratic Kampuchea. * January 11 – The 1976 ...

. It is currently in service with the

U.S. Air Force The United States Air Force (USAF) is the air service branch of the United States Armed Forces, and is one of the eight uniformed services of the United States. Originally created on 1 August 1907, as a part of the United States Army Sign ...

U.S. Navy The United States Navy (USN) is the maritime service branch of the United States Armed Forces and one of the eight uniformed services of the United States. It is the largest and most powerful navy in the world, with the estimated tonnage o ...

U.S. Marine Corps The United States Marine Corps (USMC), also referred to as the United States Marines, is the maritime land force service branch of the United States Armed Forces responsible for conducting expeditionary and amphibious operations through co ...

, and various other

air force An air force – in the broadest sense – is the national military branch that primarily conducts aerial warfare. More specifically, it is the branch of a nation's armed services that is responsible for aerial warfare as distinct from an ...

Development and deployment

The development of the GBU-12 traces back to the

Vietnam War The Vietnam War (also known by #Names, other names) was a conflict in Vietnam, Laos, and Cambodia from 1 November 1955 to the fall of Saigon on 30 April 1975. It was the second of the Indochina Wars and was officially fought between North Vie ...

. The U.S. Air Force wanted a greater variety of

s, especially a lighter and more maneuverable one to be able to hit moving targets on the Ho Chi Minh trail. Earlier designs of guided bombs such as the

BOLT-117 The Texas Instruments BOLT-117 (BOmb, Laser Terminal-117), retrospectively redesignated as the GBU-1/B (Guided Bomb Unit) was the world's first laser-guided bomb (LGB). It consisted of a standard M117 bomb case with a KMU-342 laser guidance and ...

were quickly superseded by the Paveway series of add-on kits for conventional bombs. GBU-12 bombs (along with the balance of the Paveway series) are produced by

defense contractor The arms industry, also known as the arms trade, is a global industry which manufactures and sells weapons and military technology. It consists of a commercial industry involved in the research and development, engineering, production, and se ...

Lockheed Martin The Lockheed Martin Corporation is an American aerospace, arms, defense, information security, and technology corporation with worldwide interests. It was formed by the merger of Lockheed Corporation with Martin Marietta in March 1995. It ...

and

Raytheon Raytheon Technologies Corporation is an American multinational aerospace and defense conglomerate headquartered in Arlington, Virginia. It is one of the largest aerospace and defense manufacturers in the world by revenue and market capitali ...

. Raytheon began production after purchasing the product line from

Texas Instruments Texas Instruments Incorporated (TI) is an American technology company headquartered in Dallas, Texas, that designs and manufactures semiconductors and various integrated circuits, which it sells to electronics designers and manufacturers globa ...

. Lockheed Martin was awarded a contract to compete with Raytheon when there was a break in production caused by transferring manufacturing out of

Texas Texas (, ; Spanish: ''Texas'', ''Tejas'') is a state in the South Central region of the United States. At 268,596 square miles (695,662 km2), and with more than 29.1 million residents in 2020, it is the second-largest U.S. state by ...

. "Paveway II" refers specifically to the guidance kit, rather than to the weapon itself. See also

GBU-16 Paveway II The GBU-16 Paveway II is an American Paveway-series laser-guided bomb, based on the Mk 83 general-purpose bomb, but with laser seeker and wings for guidance. The GBU-16 was introduced into service around 1976 and is used by the U.S. Air Force ...

, where the same guidance unit is fitted to a

Mk 83 The Mark 83 is part of the Mark 80 series of low-drag general-purpose bombs in United States service. Development and deployment The nominal weight of the bomb is 1,000 lb (454 kg), although its actual weight varies between 985 ...

1,000-lb bomb (454 kg). The GBU-12 has been used in numerous conflicts such as the

Gulf War The Gulf War was a 1990–1991 armed campaign waged by a 35-country military coalition in response to the Iraqi invasion of Kuwait. Spearheaded by the United States, the coalition's efforts against Iraq were carried out in two key phases: ...

where the U.S. Air Force reports an 88% hit rate. It is among the most commonly used guided munitions, and as such is able to be dropped from a very wide variety of aircraft, such as the

B-52 The Boeing B-52 Stratofortress is an American long-range, subsonic, jet-powered strategic bomber. The B-52 was designed and built by Boeing, which has continued to provide support and upgrades. It has been operated by the United States Air ...

A-10 The Fairchild Republic A-10 Thunderbolt II is a single-seat, twin-turbofan, straight-wing, subsonic attack aircraft developed by Fairchild Republic for the United States Air Force (USAF). In service since 1976, it is named for the Republic ...

F-15E The McDonnell Douglas (now Boeing) F-15E Strike Eagle is an American all-weather multirole strike fighter derived from the McDonnell Douglas F-15 Eagle. The F-15E was designed in the 1980s for long-range, high-speed interdiction without relyin ...

, and

F/A-18 The McDonnell Douglas F/A-18 Hornet is an all-weather, twin-engine, supersonic, carrier-capable, multirole combat aircraft, designed as both a fighter and attack aircraft (hence the F/A designation). Designed by McDonnell Douglas (now part ...

Guidance

The

US Department of Defense The United States Department of Defense (DoD, USDOD or DOD) is an executive branch department of the federal government charged with coordinating and supervising all agencies and functions of the government directly related to national sec ...

has upgraded GBU-12 production versions to include GPS guidance modes. Lockheed Martin is the sole source for US Navy purchases of this version. Raytheon sells upgraded GBU-12s to the US Government and 23 other nations.

Laser-guided bomb A laser-guided bomb (LGB) is a guided bomb that uses semi-active laser guidance to strike a designated target with greater accuracy than an unguided bomb. First developed by the United States during the Vietnam War, laser-guided bombs quickly pr ...

s are often labeled "

smart bomb Smart or SMART may refer to: Arts and entertainment * ''Smart'' (Hey! Say! JUMP album), 2014 * Smart (Hotels.com), former mascot of Hotels.com * ''Smart'' (Sleeper album), 1995 debut album by Sleeper * ''SMart'', a children's television ser ...

s" because they are able to follow a non-ballistic trajectory when

laser A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The word "laser" is an acronym for "light amplification by stimulated emission of radiation". The ...

designation of the intended target is undertaken. According to Raytheon's fact sheet for the Paveway 2, 99 deliveries of

guided munition A precision-guided munition (PGM, smart weapon, smart munition, smart bomb) is a guided munition intended to precisely hit a specific target, to minimize collateral damage and increase lethality against intended targets. During the First Gulf ...

s will yield a

circular error probable In the military science of ballistics, circular error probable (CEP) (also circular error probability or circle of equal probability) is a measure of a weapon system's precision. It is defined as the radius of a circle, centered on the mean, ...

(CEP) of only , versus a CEP of for 99

unguided bomb An unguided bomb, also known as a free-fall bomb, gravity bomb, dumb bomb, or iron bomb, is a conventional or nuclear aircraft-delivered bomb that does not contain a guidance system and hence simply follows a ballistic trajectory. This describe ...

s dropped under similar conditions. Paveway II laser-guided bombs use what is known as " bang bang" guidance. This means the bomb's fins deflect fully, rather than proportionally when it is attempting to guide to the laser spot. For example, if it sees the laser spot and determines that it should make a change it deflects its fins until it has over-corrected and then it deflects back the opposite direction, creating a

sinusoidal A sine wave, sinusoidal wave, or just sinusoid is a mathematical curve defined in terms of the '' sine'' trigonometric function, of which it is the graph. It is a type of continuous wave and also a smooth periodic function. It occurs often i ...

type of flight path. This type of guidance may be less efficient at times, however is more cost-effective and allows the use of simpler electronics in the guidance system.

References

External links

Raytheon's official Paveway fact page
{{USAF Weapons Guided bombs of the United States Texas Instruments Military equipment introduced in the 1970s