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""
Organization of the United States Marine Corps of its officers from the United States Naval Academy and Navy Reserve Officer Training Corps (NROTC), which are partially staffed by Marines. Marine Corps drill instructors contribute to training naval officers in Officer Candidate School. Marine aviators are trained in the Naval Aviation training pipeline, and utilize naval-weapons and test-pilot schools. Currently, Navy aircraft carriers deploy with a Marine Hornet squadron alongside Navy squadrons. The Navy's Blue Angels flight team includes at least one Marine pilot and is supported by a Marine C-130 Hercules aircraft and crew. Since the Marines do not train chaplains or medical personnel, officers and enlisted