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An optical landing system (OLS) (nicknamed "meatball" or simply "ball") is used to give glidepath information to pilots in the terminal phase of landing on an aircraft carrier.

From the beginning of aircraft landing on ships in the 1920s to the introduction of OLSs, pilots relied solely on their visual perception of the landing area and the aid of the Landing Signal Officer (LSO in the U.S. Navy, or "batsman" in the Commonwealth navies). LSOs used coloured flags, cloth paddles and lighted wands. The OLS was developed after World War II by the British and was deployed on U.S. Navy carriers from 1955. In its developed form, the OLS consists of a horizontal row of green lights, used as a reference, and a column of vertical lights. The vertical lights signal whether the aircraft is too high, too low, or at the correct altitude as the pilot descends the glide slope towards the carrier's deck. Other lights give various commands and can be used to require the pilot to abort the landing and "go around." The OLS remains under control of the LSO, who can also communicate with the pilot via radio.

INFO: Full form for PCE is Power Conversion Equipment in Military and Defence category
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INFO: Full form for PCE is Power Conditioning Equipment in Military and Defence category
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INFO: Full form for PCE is Preliminary Combat Entity in Military and Defence category
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INFO: Full form for MSL is Master Station Log in Military and Defence category
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INFO: Full form for MSL is Master Support List in Military and Defence category
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INFO: Full form for MFT is Missile Facilities Technician in Military and Defence category
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INFO: Full form for MFT is Materiel Fielding Team in Military and Defence category
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INFO: Full form for LEN is Large Extension Node (mse) in Military and Defence category
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INFO: Full form for MVG is Monlon Volunteer Guard in Military and Defence category
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INFO: Full form for MFE is Manpower Force Element in Military and Defence category
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The Light Observation Helicopter (LOH) program was a United States Army program to evaluate, develop and field a light scout helicopter to replace the Army's aging Bell OH-13 Sioux. It gained impetus with the advent of the Vietnam War, and was aided by advances in helicopter technology, specifically the development of the turboshaft engine.

INFO: Full form for LAG is Limburgs Artillerie Geschut in Military and Defence category
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INFO: Full form for LQN is Logistics Queueing Network in Military and Defence category
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The Medium Girder Bridge (MGB) is a lightweight, man portable bridge and can be assembled without help from heavy equipment. In addition, it is also a deck type, two-girder bridging system capable of carrying loads up to and including Main battle tanks (MBT).

MGB was originally produced by Fairey Engineering Ltd., in Stockport England and is still made to this day by its successor WFEL based on a design by MVEE in Christchurch.

MGB was originally sold to the British Army in 1971, subsequently also being sold to many other nations, including the Dutch, Danish, Swiss, German and US Militaries.

INFO: Full form for MPP is Mutual Protection Pact in Military and Defence category
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INFO: Full form for MPP is Maritime Procedural Publication in Military and Defence category
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INFO: Full form for MPP is Massively Parallel Processors in Military and Defence category
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INFO: Full form for MPP is Mobilization Program Reassignment in Military and Defence category
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INFO: Full form for LTT is Loss To Theater in Military and Defence category
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INFO: Full form for LTT is Long Term Training in Military and Defence category
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A Marine expeditionary brigade (MEB) is a formation of the United States Marine Corps, a Marine air-ground task force of approximately 14,500 Marines and sailors constructed around a reinforced infantry regiment, a composite Marine aircraft group, a combat logistics regiment and a MEB command group. The MEB, commanded by a general officer (usually a brigadier general), is task-organized to meet the requirements of a specific situation. It can function as part of a joint task force, as the lead echelon of the Marine expeditionary force (MEF), or alone. It varies in size and composition, and is larger than a Marine expeditionary unit (MEU) but smaller than a MEF. The MEB is capable of conducting missions across the full range of military operations.

INFO: Full form for MEB is Medical Evaluation Board in Military and Defence category
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INFO: Full form for HTU is Hand Held Terminal Unit in Military and Defence category
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INFO: Full form for KCA is Knight of Canada in Military and Defence category
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INFO: Full form for DOR is Date of Release in Military and Defence category
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