One of the helicopters operated by Marine Helicopter Squadron One (HMX-1 "Nighthawks") flying near the Thomas Jefferson Memorial on a very cold and snowy morning at the Tidal Basin in Washington, D.C. Helicopter Squadron One is known for transporting the President and Vice President of the United States. When a helicopter is carrying the President, it has the call sign "Marine One" and when it is carrying the Vice President, it has the call sign "Marine Two".