The United States Marine Corps (USMC) is a branch of the United States Armed Forces responsible for providing power projectio ... n, using the mobility of the United States Navy, by Congressional mandate, to deliver rapidly, combined-arms task forces on land, at sea, and in the air. The U.S. Marine Corps is one of the four armed service branches in the U.S. Department of Defense (DoD) and one of the seven uniformed services of the United States. read more