S-5 means Army Civilian Affairs/Public Affairs Staff at the Battalion/Brigade level in
Military
Similar to S-5
26PEMR - 26th Pennsylvania Emergency Militia Regiment
278 ACR - 278th Armored Cavalry Regiment
2AD - 2nd Armored Division
2E - Role 2 Enhanced
2IC - Second In Command
2LM - Role 2 Light Maneuver
2LT - Second Lieutenant
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