ACS, C4I means Assistant Chief of Staff, Command, Control, Communications, Computers, and Intelligence in
Military
Similar to ACS, C4I
2IC - Second In Command
2LM - Role 2 Light Maneuver
2LT - Second Lieutenant
2M - Micro Miniature
2W - 2-Wire
3-D - Three-Dimensional
3-DOF - Three Degree Of Freedom
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