The crewed spacecraft would consist of 3 habitation modules, 3 docking ports, and two ferry vehicles. The spacecraft would rotate along the centerline to provide artificial gravity. It would leave Earth with the Earth Departure Stage and transfer to Mars with the Mars Transfer Stage, and rendezvous with the precursor spacecraft in Martian orbit. The craft would dock together to enable the crew to transfer to the ferry vehicles for descent to the surface at a selected site. The crew, along with the equipped rovers, would spend 14 months to explore the Martian surface. The crew would return to Martian orbit with the ferry vehicle and rendezvous and dock with the orbiting crewed spacecraft. After a detailed inspection of the vehicle, the spacecraft would leave Mars for Earth on the Earth Return Stage. When the craft is captured in a Molniya orbit around Earth, the crew would board a ferry vehicle for transfer to low Earth orbit and rendezvous and dock with the waiting Skylon spacecraft for return to Earth.