VH-3D Seaking / Marine OneVH 3D SeaKing Marine One helicopter model. The Sikorsky Marine 1 is a VH 3D. The VH 3D is a twin engine, all weather helicopter flown by Marine Helicopter Squadron One (HMX 1) and supports the executive transport mission for the President of the United States. The VH 3D has been in use for approximately 25 years and is the helicopter transport for the President of the United States, Vice President, and other visiting heads of state. It has seating