- COMPO-1 (Active Component of the military)
- COMPO-2 (Army National Guard Component of the Military)
- COMPO-3 (United States Army Reserve Component of the MIlitary)
- COMPO-4 (Unresourced Force Structure component of the Miiltary)
- COMPO-5 (Delta between A[pproved Forces and On-hand Forces)
- COMPO-6 (Pre-Positioned Units Component of the Military)
- COMPO-7 (Direct Host Nation Support for the Military)
- COMPO-8 (Indirect Host Nation Support offsets for the Military)
- COMPO-9 (Logistical Civil Augmentation Program Component of the Military)
- COMPOST (The Washington Post)
- COMPO-Z (Tenant Organizations Resident on Army Installations)
- COMPR (completion program report)
- CompSci (Computer Science)
- COMPTUEX (COMPosite Training Unit EXercise)
- COMPU (computest report)
- COMPUSEC (Computer Security)
- COMPUTER (Common Operating Machine Particularly Used for Trade, Education, and Research)
- COMR (Confirmation Of Message Receipt)
- COMRAT (Commuted Ration)
- COMRE (completion record log)
- COMREG (Communication Region)
- COMRELs (Community Relations Project)
- COMS (City Of Manchester Stadium)
- COMSA (Colorado Masters Swimming Association)
- COMSAT (Communications Satellite Corporation)
- COMSC (COMmander, Military Sealift Command)
- COMSCINST (COMmander, Military Sealift Command INSTruction)
- COMSEC (COMmunications SECurity)
- COMSIT (Common Situation)
- COMSOC (IEEE Communications Society)
- COMSOCCENT (COMmander, Special Operations Command, United States CENTral Command)
- COMSOCEUR (COMmander, Special Operations Command, United States EURopean Command)
- COMSOCPAC (COMmander Special Operations Command, United States PACific Command)
- COMSOCSOUTH (COMmander Special Operations Command, United States SOUTHern Command)
- COMSOF (COMmander, Special Operations Forces)
- COMSPAWARSYSCOM (COMmander SPAce and Naval WARfare SYStems COMmand)
- COMSR (Communication Support Requirements)
- COMSTAT (COMmunications STATus)
- COMSUBFOR (COMmander, SUBmarine FORce)
- COMSUBLANT (COMmander, SUBmarine force AtLANTtic)
- COMSUBPAC (COMmander SUBmarine Force, United States PACific Fleet)
- COMSUPNAVFOR (COMmander, SUPporting NAVal FORces)
- COMSY (Commissary)