Private First Class Tyler Severns Platoon 1069, Delta Company, 1st Recruit Training Battalion, stands at parade The Color Sergeant of the Marine Corps is the senior most sergeant in the U.S. Marine Corps, responsible for carrying the national ensign in ceremonies at Marine Barracks Washington, D.C. and across the Marines adopt new uniform rules for cammies, dress blues Dress blue alphas hi res stock photography and images Alamy