STRI - syst
- SWIM
- swimmer delivery vehicle
- swimmer life support system
- swimmer support system
- swimmer weapons system
- SWIMS
- SWIO
- SWIP
- SWIR
- switch and control subsystem
- switchboard
- switchboard operator
- switched network automatic routing system
- switching center
- switching central
- switching unit
- switching, transmitting, receiving, and distribution (system)
- swiveling gunner's station
- SWL
- SWLT
