Preparations for this new goal include slashing the number of Moon landings so funding and leftover Apollo spacecraft hardware can go towards the efforts of the crewed Mars mission. Apollo 12 still lands, Apollo 13 still suffers its disaster, but Apollo 14 is crewed by the astronauts of the cancelled Apollo 15 mission to carry out the scientific experiments on the lunar surface, and is the last crewed Moon landing. At the same time, the NERVA program is revived to become the chosen Mars spacecraft development, with larger tests in Nevada, but without containment and plagued with engineering problems.