Apollo program missions. Apollo 13's Fra Mauro mission was reassigned to Apollo 14, commanded in February 1971 by Mercury veteran Alan Shepard, with Stuart Roosa and Edgar Mitchell. This time the mission was successful. Shepard and Mitchell spent 33 hours and 31 minutes on the surface, and completed two EVAs totalling 9 hours 24 minutes, which was a record for the longest EVA by a lunar crew at the time. In August 1971, just after conclusion of the Apollo 15 mission, President Richard Nixon proposed canceling the two remaining lunar landing missions, Apollo 16 and 17. Office of Management and Budget Deputy
Apollo Applications Program pilot was a concern for mission planners, so proposals that it would be a three-man landing team or that the CSM would rendezvous with an orbiting module were considered. The following phases were considered: The "Apollo LM Taxi" was essentially the basic Apollo LM modified for extended lunar surface stays. This was expected to be the workhorse of both "Apollo Applications Extended Lunar Surface Missions" beginning in 1970 and to larger "Lunar Exploration System for Apollo" in the mid-to-late 1970s. The "Apollo LM Shelter" was essentially an Apollo LM with ascent stage engine and fuel tanks removed and replaced with