The Commemorative Flags Blog

The Department of the Navy – USMC Component The Department of the Navy – USMC Component That's correct! The United States Marine Corps has been a component of the Department of the Navy since June 30, 1834, proudly serving alongside its sister service, the United States Navy. The Marine Corps maintains a global presence, operating both from land-based installations and aboard amphibious warfare ships. In addition to their ground and sea capabilities, Marine Fighter Attack Squ