s - Secret 
S - Sierra 
S - Sierra Time Zone 
S of AN - School of Air Navigation 
S of TT - School of Technical Training 
S&DA - Strike and Damage Assessment 
S&E - Salute 'N Execute 
S&G - Shits 'N Giggles 
S&IA - Security and Investigative Acti… 
S&MST - space and missile system test 
S&T - Science & Technology 
S&T - Science and Technology 
S&T - scientific and technical 
S&T - Supplies and Transport 
S&TI - scientific and technical intell… 
S&TT - Station & Target Towing 
S&W - Surveillance and Warning 
S&WC - Surveillance and Warning Center 
S-TRED - Standard Tactical Receive Equ… 
S.O.S - School of Signals 
S/A - Services and Agencies 
S/C - Sergeant Chef 
S/L - Squadron Leader 
S/Ldr - Squadron Leader 
S/MANCO - Space/Missile Analyst NCO 
S/S - Staff Sergeant 
SA - Secretary of the Army 
SA - Security Assistance 
SA - Selective Availability 
SA - Service Agreement