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Abbreviation
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Definition 1
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Definition 2 (if applicable)
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M1
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Prefix for New Army ASC Mechanical Transport numbers
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M2
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Prefix for ASC Electricians numbers
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MAA
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Master at Arms (RN)
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MAC
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Merchant Ship Aircraft Carrier
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Motor Ambulance Convoy
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MAD
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Military Accounts Department
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MANCH R
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Manchester Regiment
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MAP
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Ministry of Aircraft Production
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MB
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Prefix for Motor Boats RNVR numbers
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Mountain Battery (Indian)
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MBE
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Member of the Order of the British Empire
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M B SCOUTS
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Mounted Brigade Scouts (South African)
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M BTY
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Mountain Battery (Indian)
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MC
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Military Cross
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Mule Corps (Indian) Military Constabulary (South African)
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MCC
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Motor Cycle Corps (South African)
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MECH
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Mechanician (RN)
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MED
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Medium
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MEF
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Mediterranean Expeditionary Force
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Middle East Forces
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MESO R
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Mesopotamian Railways
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MFA
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Merchant Fleet Auxiliary
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MFP
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Military Foot Police
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MG
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Machine Gunner
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MGB
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Motor Gun Boat
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MG BN AIF
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Machine Gun Battalion Australian Imperial Force
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MGC
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Machine Gun Corps
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MGC CAV
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Machine Gun Corps Cavalry
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MG COY
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Machine Gun Company
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MG SQN
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Machine Gun Squadron
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MHTS
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Mahrattas (Indian)
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MI
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Mounted Infantry
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MID
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Midshipman (RN)
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Mention in Despatches
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MIDD’X R
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Middlesex Regiment
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MIRS
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Military Intelligence Research Section
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MK
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Militere Konstabelary (South African)
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Mark
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ML
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Motor Launch
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M/L
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Minelayer
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MM
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Military Medal
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Motor Mechanic – RNVR rank
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MMGS
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Motor Machine Gun Service
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MMP
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Military Mounted Police
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MMR
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Mercantile Marine Reserve
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MO
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Medical Officer
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MOBN
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Mobilization
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MOB VETY SEC
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Mobile Veterinary Section
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MOD
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Ministry of Defence
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MOMBASA DF
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Mombasa Defence Force
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MON
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Monmouthshire Regiment
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MPSC
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Military Provost Staff Corps
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MR
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Mounted Rifles
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MRAF
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Marshal of the Royal Air Force
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MS
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Mechanical Specials – prefix for Old Army ASC numbers
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M/S
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Minesweeper
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MSM
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Meritorious Service Medal
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MT
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Mechanical Transport
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Motor Transport
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MTC
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Miscellaneous Trades Company (South African)
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Mechanised Transport Corps
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MTD BDE
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Mounted Brigade
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MTN BTY
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Mountain Battery (Indian)
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MU
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Maintenance Unit (RAF)
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MULE CPS
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Mule Corps (Indian)
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MUS
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Musician
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MW TEL O
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Marine Wireless Telegraph Operator (RN)
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