United States Marine Corps

branch of the United States armed forces that is trained for combat on land and on the sea and in the air and works in cooperation with the United States Navy

The United States Marine Corps (USMC) is a branch of the United States military responsible for providing power projection from the sea, utilizing the mobility of the U.S. Navy to rapidly deliver combined-arms task forces. Since the Marine Corps works alongside U.S. Naval forces, it is part of the Department of the Navy for administrative purposes.
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Noun
1. an amphibious division of the United States Navy
(synonym) United States Marines, Marine Corps, US Marine Corps, USMC
(hypernym) naval unit
(part-holonym) United States Navy, US Navy, USN
(member-meronym) Marine, devil dog, leatherneck, shipboard soldier
(part-meronym) Marine Corps Intelligence Activity, MCIA