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 15 voyage, and Apollo 15 was the first lunar landing mission on which there was a heavy emphasis on science. If Apollo 15 had flown as an H mission, it would have been with CSM-111 and LM-9. That CSM was used by the Apollo–Soyuz Test Project in 1975, but the lunar module went unused and is now on display at the Kennedy Space Center Visitor Complex. Technicians at the Kennedy Space Center had some problems with the instruments in the service's module's SIM bay. Some instruments were late in arriving, and principal investigators or representatives of NASA contractors sought additional testing