United States Marine Corps served as a convenient resource for interventions and landings to protect American interests overseas. The Corps was involved in over 28 separate interventions in the 30 years from the end of the American Civil War to the end of 19th century. They would be called upon to stem political and labor unrest within the United States. Under Commandant Jacob Zeilin's tenure, Marine customs and traditions took shape: the Corps adopted the Marine Corps emblem on 19 November 1868. It was during this time that "The Marines' Hymn" was first heard. Around 1883, the Marines adopted their current motto ""Semper Fidelis""
National Museum of the Marine Corps in the Washington Navy Yard, which closed on July 1, 2005, and the Marine Corps Air-Ground Museum in Quantico, Virginia, which closed on November 15, 2002. A public-private venture, the museum is a cooperative effort between the United States Marine Corps and the Marine Corps Heritage Foundation. The Foundation manages the museum operation, while the museum building will be donated to the Marine Corps. Designed by Curtis W. Fentress of Fentress Architects, the museum's exterior is meant to "evoke the image of the flag raisers of Iwo Jima," an image that is also preserved by the Marine Corps War Memorial.