| Acronym | Definition |
| 1 pdr | One pounder |
| 1cl | First class |
| 1st | First |
| A Ex Serv | Army Exchange Service |
| A Int Sec | Air Intelligence Section |
| A&NMB | Army & Navy Munitions Board |
| A/B Comd | Airborne Command |
| a/r | At the rate of |
| AA | Antiaircraft |
| AAA | Antiaircraft artillery |
| AAF | Army Air Forces |
| AB | Air Base |
| AC | Air Corps |
| ACofS | Assistant Chief of Staff |
| ACofS, G-1 | ACofS Personnel Division |
| ACofS, G-2 | ACofS Military Intelligence Division |
| ACofS, G-3 | ACofS Operations and Training Division |
| ACofS, G-4 | ACofS Supply Division |
| ACofS, OPD | ACofS Operations Division |
| ACofS, WPD | ACofS War Plans Division |
| Actg | Acting |
| AD | Active duty |
| ADC | Aide-de-camp |
| Add | Additional |
| Adj | Adjutant |
| Adm | Administrative |
| Adm O | Administrative orders |
| Adm Serv | Administrative Services |
| Adrm | Airdrome |
| AEF | American Expeditionary Forces |
| AG | Adjutant General |
| AGD | Adjutant General's Department |
| AGF | Army Ground Forces |
| AGO | Adjutant General's Office |
| AHQ | Army headquarters |
| Ala | Alabama |
| Almt | Allotment |
| Alot | Allotted |
| Alws | Allowances |
| Am | Ammunition |
| AM 2cl | Air mechanic, second class |
| AM lcl | Air mechanie, first class |
| Amb | Ambulance |
| AMC | Army Medical Center |
| AMP | Army Mine Planter |
| Amph Comd | Amphibious Command |
| AMPS | Army Mine Planter Service |
| ANC | Army Nurse Corps |
| Anl | Animal |
| Ap | Airplane |
| Apmt | Appointment |
| APO | Army post office |
| App | Apprehended or apprehension |
| Apr | April |
| APS | Army Postal Service |
| Aptd | Appointed |
| AR | Army Regulations |
| Ar | Arrest |
| ARC | American National Red Cross |
| Ariz | Arizona |
| Ark | Arkansas |
| Ars | Arsenal |
| Artif | Artificer |
| Arty | Artillery |
| ASC | Army Specialist Corps |
| Asgd | Assigned |
| Asgmt | Assignment |
| Ash | Airship |
| Asst | Assistant |
| Asst Sec War | Assistant Secretary of War |
| AsstSecWar(Air) | Assistant Secretary of War for Air |
| AT | Antitank |
| ATC | Air Transport Command |
| Atchd | Attached |
| Atk | Attack |
| ATS | Army Transport Service |
| Aug | August |
| AUS | Army of the United States |
| Auth | Authorities |
| Auto | Automatic |
| Aux | Auxiliary |
| Av | Average |
| AVD | Aviation |
| AW | Article of War |
| AW (Co) | Aircraft warning (company) |
| AWC | Army War College |
| AWOL | Absent without leave |
| AWS | Aircraft Warning Service |
| B&Q | Barracks and quarters |
| BA | Branch assignment |
| BB | Bureau of the Budget |
| BBTC | Balloon Barrage Training Center |
| Bglr | Bugler |
| BHQ | Brigade headquarters |
| BI | Branch Immaterial |
| Bkry | Bakery |
| Bks | Barracks |
| Bln | Balloon |
| Bmbdr | Bombardier |
| Bn | Battalion |
| Bomb | Bombardment |
| BOQ | Bachelor Officers' Quarters |
| Br | Branch |
| Brig | Brigade |
| Brig Gen | Brigadier General |
| Btry | Battery |
| Bull | Bulletin |
| C | Changes |
| C | Chief |
| C Auth | Civil authorities |
| C&E | Clothing and Equipage |
| C&GS Sch | Command and General Staff School |
| CAC | Coast Artillery Corps |
| Cal | Caliber |
| Cam | Camouflage |
| Capt | Captain |
| Cas | Casual |
| Cav | Cavalry |
| CD | Coast Defense |
| CDD | Certificate of Disability for Discharge |
| CE | Corps of Engineers |
| Cen | Center or Central |
| Cert | Certificate |
| Cfr | Chauffeur |
| CG | Commanding general |
| Ch | Chaplain |
| Char | Character |
| Cir | Circular |
| Civ | Civil (or civilian) |
| Ck | Cook |
| Cl | Class |
| Cld | Colored |
| Cler | Clerical |
| Clk | Clerk |
| Clo | Clothing |
| Clr | Color |
| CM | Court Martial |
| Cml | Chemical |
| CMP | Corps of Military Police |
| Cmpn | Compilation |
| CMTC | Citizens' Military Training Camp |
| CO | Commanding officer |
| Co | Company |
| Cof | Chief of |
| CofS | Chief of Staff |
| Col | Colonel |
| Colg | College |
| Coll | Collecting |
| Colo | Colorado |
| Com | Communication |
| Comd | Command |
| Comdg | Commanding |
| Comdr | Commander |
| Comdt | Commandant |
| Comm | Commissary |
| Comtn | Commutation |
| Con objtr | Conscientious objector |
| Conc | Concentration |
| Conf | Confined |
| Confer | Conference |
| Conft | Confinement |
| Conn | Connecticut |
| Cons | Construction |
| Cont | Contract |
| Contd | Continued |
| Contl | Control |
| Convn | Convenience |
| CP | Command Post |
| Cpl | Corporal |
| CPX | Command Post Exercise |
| cs | Current series |
| CSigO | Chief Signal Officer |
| Cur | Current |
| CWO | Chief Warrant Officer |
| CWS | Chemical Warfare Service |
| DC | Dental Corps |
| DC | District of Columbia |
| DC of S | Deputy chief of staff |
| Def | Defense |
| Del acct | Delinquent account |
| Delv | Delivered or delivery |
| DEML | Detached Enlisted Men's List |
| Dent | Dental |
| DEO | District Engineer Officer |
| Dep | Depot |
| Dept | Department |
| Des | Deserted or desertion |
| Det | Detached or detachment |
| DFC | Distinguished - Flying Cross |
| DHQ | Division headquarters |
| Dir | Director |
| Dis | Disciplinary |
| Disab | Disability |
| Disch | Discharge or discharged |
| Discontd | Discontinued |
| Dishon | Dishonorable or dishonorably |
| Dismd | Dismissed |
| Disr | Disrated |
| Dist | District |
| Div | Division |
| DO | Duty Officer |
| Doc | Document |
| DOL | Detached Officers' List |
| DP | By Direction of the President |
| Dpt | Deposit |
| Dpts | Deposits |
| Drpd | Dropped |
| DS | Detached service |
| DSC | Distinguished - Service Cross |
| DSM | Distinguished - Service Medal |
| Dsmtd | Dismounted |
| Dy | Duty |
| E | East |
| ea | Each |
| EAD | Extended active duty |
| EG | Expert gunner |
| Elec | Electrical or electrician |
| EM | Enlisted man or men |
| Emb | Embarkation |
| Emerg | Emergency |
| Engr | Engineer |
| Enl | Enlisted |
| Enlmt | Enlistment |
| EPTI | Existed prior to induction |
| ER | Expert Rifleman |
| ERC | Enlisted Reserve Corps |
| ETS | Expiration of term of service |
| Evac | Evacuation |
| Evid | Evidence |
| Ex | Excellent |
| Ex | Executive |
| Exp | Expiration |
| F/S | Final Statement |
| FA | Field Artillery |
| FD | Finance Department |
| Feb | February |
| Fed | Federal |
| Fig | Figure |
| Fin | Finance |
| Fis | Fiscal |
| Fla | Florida |
| Fld | Field |
| Flt | Flight |
| FM | Field Manual |
| FO | Field orders |
| FO | Finance Officer |
| Forf | Forfeit |
| fr | From |
| Fraud | Fraudulent |
| FS | Film Strip |
| FSR | Field Service Regulations |
| Ft | Fort |
| Fur | Furlough |
| Furn | Furnished |
| Fwd Ech | Forward Echelon |
| Fy | Fiscal year |
| Har | Harbor |
| HD | Harbor defense |
| HDC | Harbor Defense Command |
| HE | High explosive |
| Hon | Honor or honorable |
| Hosp | Hospital |
| How | Howitzer |
| Hq | Headquarters |
| Hv | Heavy |
| I&I Report | Inventory and Inspection Report |
| IG | Inspector General |
| IGD | Inspector General's Department |
| Ill | Illinois |
| in | Inch |
| Inc] | Inclosure |
| Incld | Include |
| Ind | Indiana |
| Ind | Indorsement |
| Indctd | Inducted |
| Inf | Infantry |
| Ins | Insurance |
| Inst | Instrument |
| Instl | Installation |
| Instr | Instructor |
| Int | Intelligence |
| Intn | International |
| Intpr | Interpreter |
| JA | Judge Advocate |
| JAG | Judge Advocate General |
| JAGD | Judge Advocate General's Department |
| Jan | January |
| Jd | Joined |
| Jn | Join |
| Jr | Junior |
| Jul | July |
| Kans | Kansas |
| Kd | Killed |
| Ki | Kitchen |
| Ky | Kentucky |
| L | Light |
| La | Louisiana |
| Lab | Laboratory |
| LC | Lines of Communication |
| LD | Line of duty |
| Ldr | Leader |
| Ldry | Laundry |
| LDS | Line of duty status |
| LE | Low explosive |
| Leg | Legislative |
| LMG | Light machine gun |
| Ln | Liaison |
| Lt | Lieutenant |
| Lt col | Lieutenant colonel |
| Lt Gen | Lieutenant General |
| Ltd serv | Limited service |
| Ltr | Letter |
| Lv | Leave |
| M Sgt | Master Sergeant |
| M/R | Memorandum Receipt |
| M/R | Morning Report |
| Ma] | Major |
| Maint | Maintenance |
| Maj Gen | Major general |
| Man | Manual |
| Mar | March |
| Mass | Massachusetts |
| MC | Medical Corps |
| MCM | Manual for Courts-martial |
| Md | Maryland |
| MD | Medical Department |
| Mdl | Model |
| Me | Maine |
| Mech | Mechanic |
| Mecz | Mechanized |
| Med | Medical |
| Med Adm C | Medical Administrative Corps |
| Memo | Memorandum |
| Met | Meteorological |
| MG | Machine gun |
| MH | Medal of Honor |
| MI | Military Intelligence |
| Mich | Michigan |
| Mil | Military |
| Mil Att | Military attache |
| Mil av | Military aviator |
| Minn | Minnesota |
| Misc | Miscellaneous |
| Miss | Mississippi |
| Mk | Mark |
| Mkm | Marksman |
| mm | Millimeter |
| Mo | Missouri |
| Mo | Month |
| Mon | Monday |
| Mont | Montana |
| MOS | Military occupational specialty specification serial number |
| Mos | Months |
| MP | Military police |
| MR | Mobilization Regulations |
| MRU | Machine Records Unit |
| Msg | Message |
| Msg Cen | Message center |
| Msgr | Messenger |
| MT | Motor Transport |
| Mtd | Mounted |
| MTP | Mobilization Training Program |
| Mtrcl | Motorcycle |
| Mtrclt | Motorcyclist |
| Mtz | Motorized |
| Mus | Musician |
| N | North |
| N Dak | North Dakota |
| N Mex | New Mexico |
| NC | North Carolina |
| NCO | Noncommissioned officer |
| NCS | Net Control Station |
| Nebr | Nebraska |
| Nev | Nevada |
| NGB | National Guard Bureau |
| NH | New Hampshire |
| NJ | New Jersey |
| Nov | November |
| NY | New York |
| O | Office, Officer, Order, or Orders |
| O USec War | Office Under Secretary of War |
| o/a | On or about |
| O/C | Officer in charge |
| Obsn | Observation |
| Obsr | Observer |
| OC | Officer candidate |
| OCNGA | Officer in Charge of National Guard Affairs |
| OCS | Officer Candidate School |
| Oct | October |
| OD | Officer of the day |
| od | Olive drab |
| Odly | Orderly |
| OG | Officer of the Guard |
| Okla | Oklahoma |
| Opn | Operation |
| Opr | Operator |
| Ops | Opinions |
| OQMG | Office of The Quartermaster Genera] |
| OR | Organized Reserves |
| ORC | Officers' Reserve Corps |
| Ord | Ordnance |
| Ord Dept | Ordnance Department |
| Oreg | Oregon |
| Orgn | Organization |
| OS&D | Over, Short, and Damaged Report |
| P/E | Port of embarkation |
| P/R | Pay roll |
| Pa | Pennsylvania |
| Par | Paragraph |
| Part | Partial |
| PC | Panama Canal |
| Pd | Paid |
| Perm | Permanent |
| Pers | Personnel |
| Pfc | Private, first class |
| Pgn | Pigeon |
| PH | Purple Heart |
| PHosp | Post hospital |
| Photo | Photograph or photographic |
| Pion | Pioneer |
| Pk | Pack |
| Pkmr | Packmaster |
| Pkr | Packer |
| PL | Post Laundry |
| PM | Provost marshal |
| PMG | Provost Marshal-General |
| PMS&T | Professor of Military Science and Tactics |
| Pmt | Payment |
| Pnt | Patient |
| Pon | Ponton |
| PR | Puerto Rico |
| Prcht | Parachute |
| Prim | Primary |
| Princ | Principal |
| Pris | Prisoner |
| Prof | Professor |
| Prov | Provisional |
| PS | Philippine Scouts |
| Pt | Point |
| Pub | Public |
| Publ | Publication |
| Pur | Pursuit |
| Pvt | Private |
| PW | Prisoner of War |
| QM | Quartermaster |
| QMC | Quartermaster Corps |
| QMG | Quartermaster General |
| QMSO | Quartermaster Supply Officer |
| Qrs | Quarters |
| Qual | Qualified |
| R Sta | Regulating Station |
| R/S | Report of Survey |
| RA | Regular Army |
| Rad | Radio |
| RAR | Regular Army Reserve |
| Rat | Rations |
| Rcn | Reconnaissance |
| Rcs | Resources |
| Rct | Recruit |
| Rctg | Recruiting |
| Rd | Reduce or reduced |
| Rdg | Reducing |
| Reaptd | Reappointed |
| Rec | Recreation |
| Recd | Received |
| Recp Cen | Reception Center |
| Reenl | Reenlist |
| Reenlmt | Reenlistment |
| Reg | Regular |
| Regt | Regiment |
| Rejd | Rejoined |
| Reld | Relieved |
| Rep | Repair |
| Repl | Replacement |
| Req | Requisition |
| Reqmt | Requirements |
| Requal | Requalified |
| Res | Reserve |
| Resc | Resecinded |
| Resgd | Resigned |
| Ret | Retired |
| Retmt | Retirement |
| Rets | Returns |
| RI | Rhode Island |
| Rmt | Remount |
| RO | Regimental orders |
| ROTC | Reserve Officers' Training Corps |
| rpm | Revolutions per minute |
| Rpt | Report |
| RR | Railroad |
| RTC | Replacement Training Center |
| RTO | Railroad transportation officer |
| Ry | Railway |
| S | South |
| S Dak | South Dakota |
| S sgt | Staff sergeant |
| S&B | Sterilization and Bath |
| S/C | Statement of Charges |
| S/R | Service Record |
| SA | Small arms |
| Salv | Salvage |
| Sat | Saturday |
| Sb | Switchboard |
| SC | South Carolina |
| SC | Summary court |
| scd | Scheduled |
| Sch | School |
| SCM | Special court martial |
| SCM | Summary court martial |
| sd | Same date |
| SD | Special Duty |
| Sec | Section |
| Sec War | Secretary of War |
| Sent | Sentence |
| Sentd | Sentenced |
| Sep | Separate |
| Sept | September |
| Serv | Service |
| Serv C | Service Command |
| SG | Surgeon General |
| Sgt | Sergeant |
| Shipt | Shipment |
| Sig | Signal |
| Sig C | Signal Corps |
| Sk | Sick |
| SL Btry | Searchlight battery |
| SM | Soldier's Medal |
| SMG | Submachine gun |
| Sn | Sanitary |
| SO | Special orders |
| SOP | Standard operating procedure |
| SOS | Services of Supply |
| sp | Special |
| Sp msgr | Special messenger |
| Spec trs | Special troops |
| Specl | Specialist |
| Sq | Squadron |
| Sqd | Squad |
| SS | Selective Service |
| ss | Sharpshooter |
| Sta | Station |
| Sta com | Station complement |
| Stab | Stable |
| Statl | Statistical |
| Steno | Stenographer(s) |
| Stev | Stevedore |
| Stew | Steward |
| Stf | Staff |
| Str | Strength |
| Stu | Student |
| SU | Service Unit |
| Sub | Subject |
| Subm | Submarine |
| Subs | Subsistence |
| Sum | Summary |
| Sun | Sunday |
| Sup | Supply |
| Suppl | Supplemental |
| Surg | Surgeon |
| Surg | Surgical |
| Surr | Surrendered or surrender |
| Susp | Suspended |
| T | Transport or transportation |
| T of Opns | Theater of Operations |
| T Sgt | Technical Sergeant |
| T/A | Tables of Allowances |
| T/BA | Tables of Basic Allowances |
| T/E | Tables of Equipment |
| T/O | Tables of Organization |
| T/R | Transportation Request |
| TA | Territorial assignment |
| Tac | Tactical |
| TAG | The Adjutant General |
| TC | Training Cireular |
| TC | Transportation Corps |
| TD | Tank destroyer |
| TDN | Travel directed is necessary in the military service |
| TDT/FC | Tank Destroyer Tactical and Firing Center |
| Tech | Technical |
| Techn | Technician |
| Telg | Telegram |
| Temp | Temporary |
| Tenn | Tennessee |
| Tex | Texas |
| TF | Training Film |
| Tg | Telegraph |
| TH | Territory of Hawaii |
| Thurs | Thursday |
| Tk | Tank |
| TM | Technical Manual |
| TM | Training Manual |
| Tn | Train |
| Tng | Training |
| Top | Topographical |
| Tor | Torpedo |
| Tp | Telephone |
| TPA | Travel by officer or his dependents by privately owned automobile is authorized. DS for officer's travel is authorized |
| TR | Technical Regulations |
| Tr | Troop |
| Trac | Tractor |
| Trfd | Transferred |
| Trk | Truck |
| Trne | Trainee |
| TU | Training Unit |
| Tues | Tuesday |
| TWX | Teletypewriter exchange (message) |
| U Sec War | Under Secretary of War |
| Unasgd | Unassigned |
| Unsat | Unsatisfactory |
| USEO | United States Engineer Office |
| USMA | United States Military Academy |
| USMC | United States Marine Corps |
| USN | United States Navy |
| USP&DO | United States Property and Disbursing Officer |
| Va | Virginia |
| VC | Veterinary Corps |
| Vis | Visual |
| VO | Verbal orders |
| VOC | Volunteer Officer Candidate |
| Vol | Volunteer |
| Vou | Voucher |
| Vt | Vermont |
| W | West |
| W Va | West Virginia |
| WAAC | Women's Army Auxiliary Corps |
| Wag | Wagon |
| Wash | Washington |
| WD | War Department |
| WDGS | War Department General Staff |
| Wea | Weather |
| Wed | Wednesday |
| Wg | Wing |
| Wis | Wisconsin |
| Wkr | Wrecker |
| WO | Warrant officer |
| WOJG | Warrant Officer, Junior Grade |
| WP | Will proceed to |
| Wrnt | Warrant |
| Wyo | Wyoming |
| Yd | Yard |
| Z of I | Zone of interior |