JRSOI means Joint Reception, Staging, Onward Movement, and Integration in
Military
Similar to JRSOI
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
2M - Micro Miniature
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