STRI - syst
- STW
- STWS
- STX
- SU
- su
- SUA
- SUAM
- SUAS
- SUAV
- SUB
- sub
- sub-lieutenant
- SUBACLANT
- subaltern
- subammunition, antitank
- subarea petroleum office
- subassembly
- subcaliber training device
- SUBCOM
- subcom
- subcommittee
- Subcommittee of the Chiefs of Staff
- Subcommittee on Frequency Allocations
- subcontract change notice
- subcontractor
- subcontractor change request
- subcontractor information request
- subd
- subdivision
- subdivision manager
- SUBDIZ
- SUBFOR
- subgroup
- Subgroup on Assessment of Weapons
- subgroup on tactical air
- subject indicator code
- subject to approval
- SUBL
- SUBLT
- SUBM
