Military Titles & Offices
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O
| O2E | Officer in charge 2nd Echelon. |
| O.C. | Officer Commanding. |
| offr | Officer. |
| offg | Officiating. As in officiating officer. |
| OIC | Officer-in-charge (of). |
| O. i/c. | Officer-in-charge. |
| OO | Ordnance officer or Operation order. |
| O.R. O/Ranks |
Other Rank/s. (Below the rank of Warrant Officer). |
| O.R.S. | Orderly Room Sergeant. |
| O.R.Q.M.S. | Orderly Room Quartermaster Sergeant. |
Staff Sergeant