Apollo 15 went unused, due to the explosion that damaged the Apollo 13 spacecraft. Apollo 14's CMP, Stu Roosa, was enthusiastic about geology, but the mission commander, Alan Shepard, less so. Scott, once assigned as Apollo 15 commander, was determined that his crew bring back the maximum amount of scientific data possible, and met with Silver in April 1970 to begin planning the geological training. The assignment of Schmitt as Apollo 15's backup LMP made him an insider, and allowed him to spark competition between the prime and backup crews. The cancellation of two Apollo missions in September 1970 transformed Apollo 15
Apollo Applications Program the second stage and enter the now-empty fuel tanks. It was also suggested that the Apollo Telescope and Survey Mission modules might be docked to the Wet Workshop to create a modular space station. The "Planetary Grand Tour" was moved to the Mariner program as "Mariner Jupiter-Saturn", which was later calved off into the Voyager program. Two probes were launched in 1977 on Titan IIIE rockets, with "Voyager 2" completing the full Grand Tour in 1989. Originally, AAP missions would alternate with Apollo lunar missions, starting in 1969. However, when NASA's 1969 budget was cut, focus was shifted to the