| A-2 | Air Forces intelligence |
| AAF | Army Air Forces |
| ACSI | Assistant Chief of Staff for Intelligence |
| AEF | American Expeditionary Forces |
| AFPAC | U.S. Army Forces, Pacific |
| AIA | Army Intelligence Agency |
| AIB | Allied Intelligence Bureau |
| AIS | Army Intelligence and Security (branch) |
| ALSOS | secret World War II mission to investigate Nazi atomic research |
| ANCIB | Army-Navy Communications Intelligence Board |
| ANCICC | Army-Navy Communications Intelligence Coordinating Committee |
| ASA | Army Security Agency |
| ATIS | Allied Translator and Interpreter Service |
| CBB | Central Bureau, Brisbane |
| CENTCOM | Central Command |
| CEWI | combat electronic warfare and intelligence |
| CIA | Central Intelligence Agency |
| CIC | Counter Intelligence Corps |
| CID | Criminal Investigation Division |
| CIP | Corps of Intelligence Police |
| COMINT | communications intelligence |
| COMSEC | communications security |
| CONARC | Continental Army Command |
| CSA | Chief of Staff of the Army |
| CONUS | Continental United States |
| DCSINT | Deputy Chief of Staff for Intelligence |
| DIA | Defense Intelligence Agency |
| DOD | Department of Defense |
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| ECM | electronic countermeasures |
| ELINT | electronic intelligence |
| ETO | European Theater of Operations |
| ETOUSA | European Theater of Operations, U.S. Army (World War II) |
| FBI | Federal Bureau of Investigation |
| FORSCOM | Forces Command |
| G-2 | Military Intelligence |
| G-3 | Military Operations |
| GARDEN PLOT | domestic intelligence collection plan (1960s) |
| GHQ | General Headquarters |
| HUMINT | human intelligence |
| IBM | International Business Machines |
| INSCOM | United States Army Intelligence and Security Command |
| IOSS | Intelligence Organization and Stationing Study |
| IRR | Investigative Records Repository |
| J-2 | joint intelligence officer |
| JCS | Joint Chiefs of Staff |
| JIC | Joint Intelligence Committee |
| JICPOA | Joint Intelligence Center, Pacific Ocean Area |
| LANTERN SPIKE | domestic intelligence collection plan (1960s) |
| MACOM | major Army command |
| MACV | Military Assistance Command, Vietnam |
| MAGIC | decrypts of Japanese diplomatic messages |
| MASINT | measurement and signature intelligence |
| MDW | Military District of Washington |
| MI | Military Intelligence |
| MID | Military Intelligence Division |
| MITC | Military Intelligence Training Center |
| MIORC | Military Intelligence Officers Reserve Corps |
| MIS | Military Intelligence Service |
| MTO | Mediterranean Theater of Operations |
| NATO | North African Theater of Operations (World War II); North Atlantic Treaty Organization |
| NATOUSA | North African Theater of Operations, U.S. Army |
| NSA | National Security Agency |
| NSC | National Security Council |
| OACSI | Office of the Assistant Chief of Staff for Intelligence |
| ONI | Office of Naval Intelligence |
| OPEC | Organization of Petroleum Exporting Countries |
| OPFOR | opposing forces |
| OSS | Office of Strategic Services |
| PEARL | intelligence derived from low-level enemy encrypted communications (World War II) |
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| PHOENIX | program to target Viet Cong infrastructure |
| POA | Pacific Ocean Area (World War II) |
| RAGFOR | Radio Group, Forward |
| ROAD | Reorganization Objective Army Division |
| RRU | radio research unit |
| SECURITY SHIELD | project to improve U.S. counterintelligence |
| SIAM | signal information and monitoring |
| SIGABA | World War II high-level cipher machine |
| SIGINT | signals intelligence |
| SIGROD | machine cipher device |
| SIS | Signal Intelligence Service |
| SSA | Signal Security Agency |
| SSO | Special Security Officer |
| STEADFAST | 1973 Army reorganization project |
| SWPA | South West Pacific Area (World War II) |
| TD | table of distribution |
| TDA | table of distribution and allowances |
| TEMPEST | threat from electronic emissions |
| THUMB | intelligence derived from radio intelligence |
| TOE | table of organization and equipment |
| TRADOC | U.S. Army Training and Doctrine Command |
| ULTRA | high-grade communications intelligence (World War II) |
| USAFFE | U.S. Army Forces, Far East |
| USAINTA | U.S. Army Intelligence Agency |
| USAINTC | U.S. Army Intelligence Command |
| USAREUR | U.S. Army Europe |
| USARPAC | U.S. Army, Pacific |
| USASA | U.S. Army Security Agency |
| USASATC&S | U.S. Army Security Agency Training Center and School |
| USCIB | U.S. Communications Intelligence Board |
| WAC | Womens' Army Corps |
| WDGS | War Department General Staff |
| YMCA | Young Men's Christian Association |
page created 10 September 2001