be the first launch of a SaturnV with a crew. On January 27, 1967, Grissom's crew was conducting a launch-pad test for their planned February 21 mission, which they named Apollo 1, when a fire broke out in the cabin, killing all three men. A complete safety review of the Apollo program followed. During this time Apollo 5 took place, an uncrewed launch to test the first lunar module (LM-1). Under the new schedule, the first Apollo crewed mission to go into space would be Apollo 7, planned for October 1968. This mission, which was to test the block II command module, did not include a lunar module. In 1967, NASA had adopted a series of lettered missions leading up to the crewed lunar landing, the "G mission", completion of one being a prerequisite to the next. Apollo7 would be the "Cmission", but the "Dmission" required testing of the crewed lunar module, which was running behind schedule and endangering John F. Kennedy's goal of Americans walking on the Moon and returning safely to Earth by the end of the 1960s. McDivitt's crew had been announced by NASA in November 1967 as prime crew for the Dmission, lengthy testing of the command and lunar modules in Earth orbit. Seeking to keep Kennedy's goal on schedule, in August 1968, Apollo Program Manager George M. Low proposed that if Apollo7 in October went well, Apollo8 would go to lunar orbit without a LM. Until then, Apollo8 was the Dmission with Apollo9 the "E mission", testing in medium Earth orbit. After NASA approved sending Apollo8 to the Moon, while making Apollo9 the Dmission, Slayton offered McDivitt the opportunity to stay with Apollo8 and thus go to lunar orbit. McDivitt turned it down on behalf of his crew, preferring to stay with the Dmission, now Apollo9. Apollo7 went well, and the crews were switched. The crew swap also affected who would be the first astronauts to land on the Moon, for when the crews for Apollo8 and9 were swapped, so were the backup crews. Since the rule of thumb was for backup crews to fly as prime crew three missions later, this put Neil Armstrong's crew (Borman's backup) in position to make the first landing attempt on Apollo 11 instead of Pete Conrad's crew, who made the second landing on Apollo 12. Framework Crew and key Mission Control personnel McDivitt was in the Air Force;