Beginning in March of 1961, the first stage of this phase, MISSOPH I, would send robotic and animal flights in larger spacecraft designed to stay aloft for up to two weeks, the average time it would take to fly to the Moon and back. This spacecraft would be more or less a larger version of the MISS spacecraft but with an airlock to facilitate spacewalks. The second stage, MISSOPH II, would take advantage of the larger Super Titan Fluorine booster to launch to extremely high altitudes. The goal would be to get the spacecraft as far as 40,000 miles from the Earth so that when it returned it would reenter the atmosphere at about 35,000 feet per second, roughly the same speed as a spacecraft returning from the Moon. The third stage, MISSOPH III, would be the first to give the pilot a lot of control owing to its radical new shape. Unlike the blunt vehicles before it, MISSOPH III would feature a flat triangular bottom reminiscent of a boost-glide vehicle so the pilot could make smooth, gliding landings on a runway.