| Abbreviation | Definition |
|---|---|
| SST | Training Submarine |
| SSTH | Super Slender Twin Hulls |
| SSUS | SS United States |
| SSV | Aircraft Carrying Submarine (Submarine Submarine, heaVier than air aircraft) |
| SSV | Sailing School Vessel |
| SSX | Next Generation Submarine |
| SW | Starboard Watch |
| T-ACS | Auxiliary Crane Ship, Military Sealift Command manned |
| TB | Torpedo Boat |
| TCD | Transport de Chaland de Debarquement |
| TELP | Totally Enclosed Life Boat |
| TS | Training Ship |
| TSHD | Trailer Suction Hopper Dredger |
| TSV | Theater Support Vessel |
| TVB | Torpedo Volg Boot (Torpedo following boat) |
| USAT | United States Army Transport |
| USCGD | United States Coast Guard Destroyer |
| USFV | United States Fishing Vessel |
| USNT | United States Naval Transport |
| USPI | U.S. Package Insert |