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Dawn breaks behind the ASTP Saturn IB launch vehicle during the Countdown Demonstration Test. The Mobile Service Structure was moved away from the vehicle for the test, which is a step-by-step dress rehearsal for the launch culminating in a simulated T-zero and launch. During the test, the stages of the Saturn IB rocket were fueled as they would be on launch day, July 15. Following the simulated liftoff, the fuels were offloaded and the terminal portion of the count was repeated the next day with the prime crewmen Thomas Stafford, Vance Brand and Donald Slayton aboard the spacecraft.