After losing three astronauts in the Apollo 1 fire on January 27, 1967, the necessary revisions to the main crew module, the command-service module put NASA behind schedule to reach the Moon by the end of the decade. But all things considered the agency recovered fairly quickly, returning to manned missions in October of 1968. The timely recovery was due in large part to some bold decisions made at management level. Like the decision to fast-track the Saturn V's schedule. Rather than test the individual pieces of the Saturn V rocket, NASA’s administration pushed for all-up testing, that is, a complete test of the rocket on an unmanned mission. This was done on Apollo 4, the mission that confirmed the Saturn V was ready to take men aloft.