| AACO | AIDS Activities Coordinating Office |
|---|---|
| AACO | Assault Airlift Control Officer |
| ADO | Assistant Duty Officer |
| AEO | Assistant Executive Officer |
| AFO | Agency Field Office (skr.) |
| AOB | Athletic Office Building (skr.) |
| DEO | Department Executive Officers |
| EMO | European Music Office |
| EPO | European Patent Office |
| ERO | European Radiocommunications Office, Európsky rádiokomunikačný úrad (skr.) |