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The Assistant Commandant of the Marine Corps (ACMC) is appointed by the President of the United States and must be confirmed via majority vote by the Senate. In the event that the Commandant is absent or is unable to perform his duties, the Assistant Commandant assumes the duties and responsibilities of the Commandant. For this reason, the Assistant Commandant is appointed to a rank equal to the sitting Commandant; since 1971, each Assistant Commandant has been, by statute, a four-star general, making it the most common rank held among Marines serving this position. Additionally, he may perform other duties that the CMC assigns to him. Historically, the Assistant Commandant has served for two to three years.

ACMC Organization
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Marine Corps Systems Command (MCSC) /hrom/NewEmployees/AbouttheMarineCorps/Organization/ACMC/ExpeditionaryEnergyOffice.aspx Marine Corps National Capital Region Command Safety Division (SAFETY)

Gen. John M. Paxton, Jr.
Assistant Commandant of the Marine Corps

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the Organization's Website