FragOrder--Fragmentary Order Fum&BathPlat--Fumigation and Bath Platoon GHQ--General Headquarters Gru--Group H&SCo--Headquarters and Service Company HD--Historical Diary Hedron--Headquarters Squadron HO3S--Sikorsky Helicopter HqBn--Headquarters Battalion HQMC--Headquarters, U.S. Marine Corps InfDiv--Infantry Division (USA) Interv--Interview ISUM--Intelligence Summary JANIS--Joint Army-Navy Intelligence Studies JCS--Joint Chiefs of Staff JMS--Japanese Minesweeper JSPOG--Joint Strategic Planning and Operations Group JTF--Joint Task Force KIA--Killed in Action KMC--Korean Marine Corps Ln--Liaison LSD--Landing Ship, Dock LSM--Landing Ship, Medium LSMR--Landing Ship, Medium-Rocket LST--Landing Ship, Tank LSTH--Landing Ship, Tank-Casualty Evacuation LSU--Landing Ship, Utility Ltr--Letter LVT--Landing Vehicle, Tracked MAG--Marine Aircraft Group MAW--Marine Aircraft Wing MS--Manuscript MedBn--Medical Battalion MedAmbCo--Medical Ambulance Company (USA) MIA--Missing in Action MISD--Military Intelligence Service Detachment (USA) MLR--Main Line of Resistance, the main front line Mosquito--North American AT-6 “Texan” Trainer; Single Engine Plane used as Airborne FAC and Target Spotting MP--Military Police MRO--Movement Report Office Msg--Message MSR--Main Supply Route MSTS--Military Sea Transport Service MTACS--Marine Tactical Air Control Squadron MTBn--Motor Transport Battalion NavBchGru--Naval Beach Group NavFE--Naval Forces Far East NCO--Noncommissioned Officer NK--North Korea(n) NKPA--North Korean People’s Army N.d.--Date not given N.t.--Time not given O--Officer; Order OCMH--Office of the Chief of Military History (USA) OI--Operation Instruction OpnO--Operation Order OpnPlan--Operation Plan OrdBn--Ordnance Battalion OY--Consolidated-Vultee Single-Engine Light Observation Plane PhibGru--Amphibious Group PIR--Periodic Intelligence Report PLA--People’s Liberation Army Plat--Platoon POL--Petroleum, Oil, Lubricants POR--Periodic Operation Report POW--Prisoner of War QMSubsistSupCo--Quartermaster Subsistence Supply Company (USA) R4D--Douglas Twin-Engine Transport (Navy and Marine designation of C-47) R5D--Douglas Four-Engine Transport RCT--Regimental Combat Team Recon--Reconnaissance Reinf--Reinforced RktBn--Rocket Battalion RM--Royal Marines ROK--Republic of Korea R&O File--Records and Orders File ROKA--Republic of Korea Army ROKN--Republic of Korea Navy Rpt--Report SAC--Supporting Arms Coordinator SAR--Special Action Report Sec--Section SecDef--Secretary of Defense ServBn--Service Battalion SigBn--Signal Battalion SigRepCo--Signal Repair Company SitRpt--Situation Report SP--Shore Party SMC--Marine Supply Squadron TAC--Tactical Air Coordinator; Tactical Air Commander