OIRA means Office of Information and Regulatory Affairs in Military
Similar to OIRA
13B - Military Occupational Specialty code for Cannon Artilleryman147FA - 147th Field Artillery Regiment
15MG - 15 Militia Group
17AD - 17th Airborne Division
180FA - 180th Field Artillery Regiment
189FA - 189th Field Artillery Regiment
1BCT - First Brigade Combat Team
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