The United States Marine Corps is 249 years old as of 2024. It was officially founded on November 10, 1775, by the Second Continental Congress during the American Revolutionary War. This date is celebrated as the official birthday of the Marine Corps. Although the original Continental Marines were disbanded after the Revolutionary War in 1783, the Marine Corps was formally re- established as a permanent military service on July 11, 1798. However, the Marine Corps continues to celebrate November 10, 1775, as its official birthday for historical and traditional reasons.