United States Marine Corp (USMC)
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From Wikipedia: United States Marine Corps:
The United States Marine Corps (USMC) is a branch of the United States armed forces responsible for providing force projection from the sea, using the mobility of the United States Navy to rapidly deliver combined-arms task forces. It is one of seven uniformed services of the United States. In the civilian leadership structure of the United States military, the Marine Corps is a component of the Department of the Navy, often working closely with U.S. naval forces for training, transportation and logistic purposes; however, in the military leadership structure the Marine Corps is a separate branch.