In official military terminology and Department of Defense shorthand, 'AC' most commonly stands for 'Active Component', referring to full-time active-duty service members who serve on continuous operational status as opposed to Reserve or National Guard personnel. Additionally, depending on the specific operational branch, tactical unit, or document context, AC can stand for 'Aircraft Commander' (the fully qualified pilot in command of a military flight), 'Armored Cavalry', or 'Area Coordinator' responsible for regional base logistics and tactical planning.
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