Marine Security Guard
A Marine Security Guard (MSG), also known as a Marine Embassy Guard, is a member of the Marine Corps Embassy Security Group (formerly Marine Security Guard Battalion), a brigade-sized organization of the United States Marine Corps (USMC) whose detachments provide security at American embassies, consulates, and other official U.S. government offices, such as the United States Mission to NATO in Brussels, Belgium. The USMC has a long history of cooperation with the U.S. Department of State, which administers the nation's diplomatic posts; Marines have served on special missions as couriers, guards for embassies and delegations, and security for U.S. citizens in the frontier.