| Abbreviation | Definition |
|---|---|
| SEP | Signal Entry Panel |
| SEP | Soldier Enhancement Program |
| SEP | Somebody Else's Problem |
| SEP | Spherical Error Probable |
| SEP | Synthetic Environment Program |
| SEP | System Enhancement Program |
| SEP | System Evaluation Plan |
| SEPCOR | SEParate CORrespondence |
| SEPLO | State Emergency Preparedness Liaison Officer |
| SEPM | Special Emphasis Program Manager |
| SEQ | Sequence |
| SER | System Evaluation Report |
| SERA | Sequential Electrochemical Reduction Analysis |
| SERB | Selective Early Retirement Board |
| SERB | Software Engineering Review Board |
| SERE | Survival, Evasion, Resistance, and Escape |
| SERER | Survival, Evasion, Resistance, Escape, Recovery |
| SERF | System Engineering Research Facility |
| SERGT | Sargeant |
| SERS | Software Engineering Release System |