OUSD(AT&L) means Office of The Under Secretary of Defense
Acquisition, Technology, and Logistics in
Military
Similar to OUSD(AT&L)
1CD - 1st Cavalry Division
1LT - First Lieutenant
1MC - General Announcing System
1MX - 1st Battalion The Middlesex Regiment
1NCD - 1st Naval Construction Division
1SG - First Sergeant
1st - IOC 1st Information Operations Command
Land
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