Apollo 15 to Apollo 12, and since Apollo 11's backup crew had been designated for Apollo 13 (which did not land on the Moon), they were the first Apollo crew for a successful lunar landing mission to have backed up another such mission. Having had the opportunity to familiarize themselves with the Apollo spacecraft, they could devote more of their training time as prime crew for Apollo 15 to geology and sampling techniques. The astronauts at NASA who were scientists, such as geologist Harrison Schmitt, pushed though the early Apollo missions for a greater place for science as part of the mission,
Marion D. Hanks married Maxine Christensen and became the father of five children. Hanks served in the Presidency of the Seventy twice following the 1976 reconstitution of the First Quorum of the Seventy. Previously, he also served on the First Council of the Seventy from 1953 to 1968 and as an Assistant to the Quorum of the Twelve Apostles from 1968 to 1976. During a three-year period in the early 1960s, Hanks was the president of the LDS Church mission in England; among the missionaries in his mission were Jeffrey R. Holland and Quentin L. Cook, who both later became apostles of the