DUSA(OR) means Deputy Under Secretary of the Army for Operations Research in
Military
Similar to DUSA(OR)
189FA - 189th Field Artillery Regiment
1BCT - First Brigade Combat Team
1CAV - 1st Cavalry Division
1CD - 1st Cavalry Division
1LT - First Lieutenant
1MC - General Announcing System
1MX - 1st Battalion The Middlesex Regiment
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