| AA | Antiaircraft |
| AAF | Army Air Forces |
| Admin O | Administrative Order |
| AFPAC | U.S. Army Forces, Pacific |
| AGO | Adjutant General’s Office |
| AGS SWPA | Allied Geographic Section, Southwest Pacific
Area |
| AGWAR | Adjutant General, War Department |
| AIB GHQ SWPA | Allied Intelligence Bureau, General Headquarters
Southwest Pacific Area |
| AKA | Cargo Ship, attack |
| Amph | Amphibious, amphibian |
| APA | Transport, attack |
| APH | Transport for wounded |
| Arty | Artillery |
| ASCOM | Army Service Command |
| ATIS | Allied Translator and Interpreter Section |
| BAR | Browning automatic rifle |
| Bn | Battalion |
| Br | Branch |
| Bull | Bulletin |
| Cav | Cavalry |
| CCS | Combined Chiefs of Staff |
| CG | Commanding General |
| CINC | Commander in Chief |
| CINCPAC | Commander in Chief, U.S. Pacific Fleet |
| CINCPOA | Commander in Chief, Pacific Ocean Area |
| CINCSWPA | Commander in Chief, Southwest Pacific Area |
| CM-IN | Classified Message, incoming |
| CM-OUT | Classified Message, outgoing |
| CO | Commanding Officer |
| CofS | Chief of Staff |
| Com3dFlt | Commander, Third Fleet |
| COMINCH | Commander in Chief, U.S. Fleet |
| CTF | Commander, task force |
| CTG | Commander, task group |
| CTU | Commander, task unit |
| CVE | Aircraft carrier, escort |
| Div | Division |
| DNI | Division of Naval Intelligence |
| DUKW | Amphibian, 2½-ton, 6 × 6 truck, used
for short runs from ship to shore |
| Engr | Engineer |
| ESB | Engineer Special Brigade |
| FA | Field Artillery |
| FE | Far East |
| FEAF | Far East Air Forces |
| FEC | Far East Command |
| Flt | Fleet |
| FM | Field Manual |
| FO | Field Order |
| G-2 | Intelligence section of divisional or higher
staff |
| G-3 | Operations section of divisional or higher
staff |
| G-4 | Supply section of divisional or higher staff |
| GHQ SWPA | General Headquarters, Southwest Pacific Area |
| Gp | Group |
| GS | General Staff |
| Hist | History, historical |
| Hq | Headquarters |
| HRS DRB AGO | Historical Records Section, Departmental Records
Branch, Adjutant General’s Office |
| Inf | Infantry |
| I&HS | Information and Historical Service |
| Instns | Instructions |
| Intel | Intelligence |
| JCS | Joint Chiefs of Staff |
| Jnl | Journal |
| LCI | Landing craft, infantry |
| LCI (R) | Landing craft, infantry (rocket) |
| LCM | Landing craft, mechanized |
| LCM (R) | Landing craft, mechanized (rocket) |
| Log | Logistics |
| LSD | Landing ship, dock |
| LSM | Landing ship, medium |
| LST | Landing ship, tank |
| Ltr | Letter |
| LVT | Landing vehicle, tracked |
| M29 | Weasel |
| MC | Medical Corps |
| MI | Military Intelligence |
| Mil | Military |
| Msg | Message |
| Mtg | Meeting |
| OCMH | Office of the Chief of Military History |
| OCNO | Office of the Chief of Naval Operations |
| Off | Officer |
| ONI | Office of Naval Intelligence |
| OP | Observation post |
| OPD | Operations Division, War Department General
Staff |
| Opns | Operations |
| PCE (R) | Patrol craft, escort (rescue) |
| POL | Petrol oil and lubricants |
| Prcht | Parachute |
| QM | Quartermaster |
| Rad | Radiogram |
| Rcds | Records |
| Regt | Regiment |
| Rpt | Report |
| S-2 | Intelligence section of regimental or lower
staff |
| S-3 | Operations section of regimental or lower
staff |
| Sec | Section |
| Ser | Series |
| Sq | Squadron |
| SSUSA | Special Staff, U.S. Army |
| Stf | Staff |
| SWPA | Southwest Pacific Area |
| Tel Conf | Teletype Conference |
| USA | U.S. Army |
| USASOS | U.S. Army Services of Supply |
| USMC | U.S. Marine Corps |
| USN | U.S. Navy |
| USNR | U.S. Naval Reserve |
| USSBS | U.S. Strategic Bombing Survey |
| WD | War Department |
| WDGS | War Department General Staff |
| Wkly | Weekly |