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L-Hour-In planned helicopter operations, it is the specific hour the helicopters land in the landing zone.

LAAM Bn-Light Antiaircraft Missile Battalion.

LAAW-Light Anti-Armor Weapon

LAPES-Low Altitude Parachute Extraction System.

LCM-Landing Craft Mechanized, designed to land tanks, trucks, and trailers directly onto the beach.

LCpl-Lance Corporal.

LCU-Landing Craft Utility.

LCVP-Landing Craft, Vehicle, Personnel, a small craft with a bow ramp used to transport assault troops and light vehicles to the beach.

Le Lot-The Accelerated Pacification Campaign.

LKA-The current designation for an arrack cargo ship. See AKA.

LOACH-Light Observation and Command Helicopter.

LOC-Lines of Communication.

LOH-Light Observation Helicopter.

LOI-Letter of Instruction.

LOTS-Logistics Over the Shore.

LP-Listening Post.

LPD-Amphibious transport, dock, a ship designed to transport and land troops, equipment, and supplies by means of embarked landing craft, amphibious vehicles, and helicopters. It had both a submersible well deck and a helicopter landing deck.

LPH-Amphibious assault ship, a ship designed or modified to transport and land troops, equipment, and supplies by means of embarked helicopters.

LSA-Logistic Support Area.

LSD-Landing Ship, Dock, a landing ship designed to combat load, transport, and launch amphibious crafts or vehicles together with crews and embarked personnel, and to provide limited docking and repair services to small ships and crafts. It lacks the helicopter landing deck of the LPD.

LST-Landing Ship, Tank, landing ship designed to transport heavy vehicles and to land them on a beach.


LtCol-Lieutenant Colonel.

LtGen-Lieutenant General.


LVTE-Landing Vehicle, Tracked, Engineer, a lightly armored amphibian vehicle designed for minefield and obstacle clearance.

LVTH-Landing Vehicle, Tracked, Howitzer, a lightly armored, self-propelled, amphibious 105mm howitzer. It resembles an LVTP with a turret for the howitzer.

LVTP-Landing Vehicle, Tracked, Personnel, an amphibian vehicle used to land and/or transport personnel.

LVTR-Landing Vehicle, Tracked, Retriever, an amphibian vehicle used for repair purposes.

LZ-Landing Zone.

MAB-Marine Amphibious Brigade.

MABS-Marine Air Base Squadron.

Machine gun, .50-caliber-U.S.-built, belt-fed, recoil-operated, air-cooled automatic weapon, which weighs approximately 80 pounds without mount or ammunition; it has a sustained rate of fire of 100 rounds per minute and an effective range of 1,450 meters.

Machine gun, M60-U.S.-built, belt-fed, gas-operated, air-cooled, 7.62mm automatic weapon, which weighs approximately 20 pounds without mount or ammunition; it has a sustained rate of fire of 100 rounds per minute and an effective range of 1,000 meters.

MACS-Marine Air Control Squadron, provides and operates ground facilities for the detection and interception of hostile aircraft and for the navigational direction of friendly aircraft in the conduct of support operations.

MACG-Marine Air Control Group.

MACV-Military Assistance Command, Vietnam.

MAF-Marine Amphibious Force.

MAG-Marine Aircraft Group.

Main Force-Refers to organized Viet Cong battalions and regiments as opposed to local guerrilla groups.


MajGen-Major General.

MarCad-Marine Aviation Cadet.

MarDiv-Marine Division.

Marines-Designates a Marine regiment, e.g., 3d Marines.

MASS-Marine Air Support Squadron, provides and operates facilities for the control of support aircraft operating in direct support of ground forces.

MAU-Marine Advisory Unit, the Marine advisory unit under the Naval Advisory Group which administered the advisory effort to the South Vietnamese Marine Corps; not to be confused with a Marine Amphibious Unit.

MAW-Marine Aircraft Wing.

MCAF-Marine Corps Air Facility.

MCAS-Marine Corps Air Station.

MCCC-Marine Corps Command Center.

MCO-Marine Corps Order.

MCOAG-Marine Corps Operations Analysis Group.

MCSA-Marine Corps Supply Agency.

MEB-Marine Expeditionary Brigade.

MedCap-Medical Civilian Assistance Program.

MedEvac-Medical Evacuation.

MEF-Marine Expeditionary Force.

MGySgt-Master Gunnery Sergeant.

MIA-Missing in Action.

MilHistBr-Military History Branch.

Mortar, 4.2-inch, M30-U.S.-built, rifled, muzzle-loaded, drop-fired weapon consisting of tube, base-plate and standard; weapon weighs 330 pounds and has maximum range of 4,020 meters. Rate of fire is 20 rounds per minute.

Mortar, 60mm, Ml 9-U.S.-built, smooth-bore, muzzle-loaded weapon, which weighs 45.2 pounds when assembled; it has a maximum rate of fire of 30 rounds per minute and sustained rate of fire of 18 rounds per minute; the effective range is 2,000 meters. Mortar, 81mm, M29-U.S.-built, smooth-bore, muzzle-loaded, which weighs approximately 115 pounds when assembled; it has a sustained rate of fire of two rounds per minute and an effective range of 2,300-3,650 meters, depending upon ammunition used.

Mortar, 82mm-Soviet-built, smooth-bore, mortar, single-shot, high angle of fire weapon which weighs approximately 123 pounds; it has a maximum rate of fire of 25 rounds per minute and a maximum range of 3,040 meters.

Mortar, 120mm-Soviet- or Chinese Communist-built, smooth bore, drop or trigger fired, mortar which weighs approximately 600 pounds; it has a maximum rate of fire of 15 rounds per minute and a maximum range of 5,700 meters.

MR-5-Military Region 5, a Communist political and military sector in northern South Vietnam, including all of I Corps. NVA units in MR-5 did not report to COSVN.

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