Apollo 15 training in Hawaii, 1970s. US astronauts David R. Scott (left), commander of the Apollo 15 lunar landing mission, and James B. Irwin, lunar module pilot, training in a lunar surface simulation area. They are wearing Portable Life Support System (PLSS) apparatuses while rehearsing lunar surveying methods. The Apollo 15 mission to the Moon took place from 26 July to 7 August 1971. Scott and Irwin descended to the lunar surface, while Alfred Worden remained in lunar orbit in the Command Module. Photographed in Kapoho, Hawaii, in December 1970.