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""
Assistant Commandant of the Marine Corps who took office on 4 October 2018, when Glenn M. Walters retired. The first Marine to hold the billet as "Assistant to the Commandant" was Eli K. Cole (Allen H. Turnage being the last), while Lemuel C. Shepherd Jr. was the first to hold it as the "Assistant Commandant". Before the official title of "Assistant Commandant of the Marine Corps" was adopted in 1946, the title of the position was known as the "Assistant to the Commandant" and before 1918, known only as "Duty in the Office of the Commandant". No records exist before the outbreak of World War I