S-5 means Army Civilian Affairs/Public Affairs Staff at the Battalion/Brigade level in Military
Similar to S-5
517 PRCT - 517th Parachute Regimental Combat Team596 SSC - 596th Signal Support Company
5CCGP - Fifth Combat Communications Group
5M - Machinery, Manpower, Material, Measurement, and Method
6-DOF - Six Degree Of Freedom
60SSC - 60th Signal Service Company
615 AMOG - 615th Air Mobility Operations Group
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