FO/FAC means Forward Observer/Forward Air Controller in
Military
Similar to FO/FAC
24NAF - 24th Numbered Air Force
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
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