STRI - syst
- synthetic aperture land and sea homing (system)
- synthetic aperture laser radar
- synthetic aperture radar
- synthetic aperture radar guidance
- synthetic aperture radar interpretation system
- synthetic aperture radar system
- synthetic array radar command air-launched missile
- synthetic exercise
- synthetic flight training system
- synthetic tactics
- synthetic target imaging classification
- synthetic training
- SYNTRAN
- SYPO
- Syracuse air defense sector
- SYSAD
- SYSCOM
- SYSCON
- SYSOM
- SYSPLLTM
