| Abbreviation | Definition |
|---|---|
| RA | Red Armor |
| RA | Regiment of Artillerists |
| RA | Regular Army |
| RA | Remote Area |
| RA | Response Action |
| RA | Rise Up in Arms |
| RA | Risk Analysis |
| RA | Risk Assessment |
| RA | Rubber Armoring |
| RAA | Redeployment Assembly Area |
| RAA | Re-deployment Assembly Area |
| RAA | Régiment d'Artillerie d'Afrique |
| RAA | Relative Azimuth Angle |
| RAA | Reserve Affairs Advisor |
| RAA | Responsibility, Accountability, and Authority |
| RAAC | Regulations of Army Allowances and Charges |
| RAAF | Roswell Army Air Field |
| RAAM | Register Of Australian Archives And Manuscripts |
| RAAON | Remain At Anchor Overnight |
| RAAW | Reddit as a Weapon |