Expedition to Mars with space glider will take place in 1971

Philip Bono : Space Vehicle Design Specialist
"Bono, in common with many Mars exploration enthusiasts of the early 1960s, optimistically targeted his expedition for the favorable 1971 Earth-Mars transfer opportunity, when the energy required to reach Mars would be at a minimum. He envisioned a manned Mars spacecraft which would outwardly have resembled the X-20A Dyna-Soar single-seat orbital glider that the company was developing for the U.S. Air Force at the time."