Marine One

From Wiki 24

Marine One is the call sign used by any aircraft of the US Marine Corps carrying the President. It is a title normally bestowed on a helicopter, as the USMC has the responsibility of transporting the President by helicopter. It carries a homing device so that it can be tracked at all times.

Marine squadron, HMX-1 is the primary unit used for presidential and VIP transportation by the United States Military, along with the two VC-25 airliners (also more commonly known as "Air Force One").