| Abbreviation | Definition |
|---|---|
| STWC | Strike Warfare Commander |
| STX | Situational Training Exercise |
| STX | Staff Training Exercise |
| SU | Search Unit |
| SU | Special Unitary |
| SU | Strategy Unit |
| SUAH | Storehouse for Unit Ammunition Holdings |
| SUAV(E) | Strategic Unmanned Air Vehicle (Experimental) |
| SUAWACS | Soviet Union Airborne Warning and Command System |
| SUB | SUBmarine |
| SUBHDR | Submarine High Data Rate |
| SUBJ | Subject Sub-JIB Subordinate-Joint Information Bureau |
| SUBOPAUTH | Submarine Operating Authority Sub-PIC Subordinate-Press Information Center |
| SUBROC | Submarine Rocket |
| SUBS | Streamlined Underwater Buoyancy System |
| SUBS | Submarines |
| SUBS | Submerges |
| SUC | Shape Up, Cuba |
| SUC | Surf Current |
| SUCCESS | Synthesized UHF Computer Controlled Equipment Sub-System |