STRI - syst
- strong point/obstacle system
- structural analysis program
- structural test model
- structure and composition system
- structure improvement of operational aircraft
- structures laboratory
- STS
- STSCC
- STSM
- STSO
- STSQ
- STSR
- STT
- STTC
- STTE
- STTF
- STTS
- STU
- STUD
- student detachment
- student naval aviator
- student pilot
- Students Army Training Corps
- STUDET
- Studies, Analysis and Gaming Agency
- study advisory group
- Study Committee on Analysis of Research, Development, and Engineering
- study director
- study group
- study of Army test and evaluation
- study of automation of the logistics system
- study of management information systems support
- study of tactical airborne radar systems
- study of unmanned air vehicle
- study requirement
- study techniques for advanced radar requirements
- study to assess and validate essential reports
- STUFT
- STUP
- STV
