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Office of the Secretary of the Army
in Military
Operational Support Airlift
in Military
Open System Architecture
in Military
Office Of Special Affairs
in Military
Operational Services Agreement
in Military
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Similar to OSA
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
View all in Military