HMX-1, or Marine Helicopter Squadron One, was established on December 1, 1947, at Quantico, Virginia, making it the first United States Marine Corps helicopter squadron. Originally created to test and evaluate rotary-wing aviation, HMX-1 quickly gained prominence for its role in helicopter assault tactics during the Korean War. In 1957, HMX-1 began its most famous mission: providing helicopter transportation for the President of the United States, earning the call sign "Marine One" when the president is aboard. Today, HMX-1 continues to support presidential transport, distinguished visitors, and operational test and evaluation missions, upholding its legacy as one of the most prestigious aviation units in the Marine Corps.