| Acronym | Meaning |
 | OASDI | Old-Age And Survivors Insurance And Disability Insurance |
| OTT | Office Of Transportation Technologies |
| OMHAR | Office Of Multifamily Housing Assistance Restructuring |
| OSHRC | Occupational Safety And Health Review Commission |
| AFIS | American Forces Information Service |
| OPHS | Office Of Public Health And Science |
| USN | United States Navy |
| OTJ | Office Of Tribal Justice |
| PWBA | Pension And Welfare Benefits Administration (replaced By EBSA) |
| NDU | National Defense University |
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