Sikorsky Aircraft Corp. and Lockheed Martin signed a teaming agreement to compete jointly for the U.S. Navy's revived VXX Presidential Helicopter program. The agreement positions Sikorsky as the prime contractor, offering its H-92 medium-lift helicopter for the presidential transport mission with Lockheed Martin as the major subsystems supplier. Both companies have experience supporting presidential helicopters. Sikorsky designed and built VH-3D and VH-60N aircraft—designated "Marine One" when the president is on board. In 2005, Lockheed Martin won the contract to build the replacement fleet. The contract was terminated in 2009 at the convenience of the government after the program delivered nine test and pilot production aircraft. In addition to the VXX teaming agreement, Sikorsky and Lockheed Martin also signed a memorandum of understanding to explore business opportunities involving other Sikorsky programs.