Marine One is the call sign of any United States Marine Corps aircraft carrying the president of the United States. As of 2024, it is most frequently applied to a presidential transport helicopter operated by Marine Helicopter Squadron One (HMX-1) "Nighthawks", most commonly as the VH-3D Sea King, or less frequently as the newer VH-92A Patriot and smaller VH-60N "White Hawk". Both helicopters are called "White Tops" because of their livery. Any Marine Corps aircraft carrying the vice president of the United States without the president has the call sign Marine Two.