DIA/DHX means Defense Intelligence Agency, Directorate of Human Intelligence, Office of Document and Media Operations in
Military
Similar to DIA/DHX
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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