T-Day means Effective Day Coincident With Presidential Declaration of A National Emergency and Authorization of Partial Mobilization in
Military
Similar to T-Day
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
1NCD - 1st Naval Construction Division
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