| Abbreviation | Definition |
|---|---|
| CSEC | Communications Security Establishment Canada |
| C-SEI | Combined ( US/ German) Second Echelon Interdiction |
| CSEL | Circuit Switch Select Line |
| CSEL | Combat Survivor Evader Locator |
| CSEL | Command Senior Enlisted Leader |
| CSEP | CJCS (Chairman of the Joint Chiefs of Staff) Sponsored Exercise Program |
| CSERIAC | Crew Systems Ergonomics Information Analysis Center |
| CSERIAC | rew Systems Ergonomics Information Analysis Center |
| CSF | Combat Special Forces |
| CSF | Combined Support Force |
| CSF | Commander, Special Forces |
| CSF | Comprehensive Soldier Fitness |
| CSF | Critical Success Factors |
| CSG | Carrier Strike Group |
| CSG | Chairman's Staff Group |
| CSG | Coordinating SubGroup |
| CSG | Corps Support Group |
| CSG | Crankshaft Start Generator |
| CSG | Cryptologic Services Group (DOD) |
| CSG | Cryptologic Support Group (Air Force) |