Marine One is the call sign of any United States Marine Corps aircraft carrying the President of the United States. It usually denotes a helicopter operated by the HMX-1 "Nighthawks" squadron, either the large VH-3D or the newer, smaller VH-60N Whitehawk. 2D color image of the HMX-1 squadron seal on front and 2D image of Marine One helicopter over the White House on back. 1.75" in diameter.