COMMUNICATIONS! Join our communications server! MEMBERSHIP! Tryouts announced on the communications server! The United States Marine Corps (USMC), also referred to as the United States Marines, is the maritime land force service branch of the United States Armed Forces responsible for conducting expeditionary and amphibious operations through combined arms, implementing its own infantry, artillery, aerial and special operations forces. The U.S. Marine Corps is one of the five uniformed branches in Dellkiller123's Military.