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Apollo 4, also known as SA-501, was the first, uncrewed, flight in the United States Apollo program, and the first test of the Saturn V launch vehicle, the rocket that would be used to send astronauts to the Moon. The space vehicle was the first to be launched from Kennedy Space Center in Florida, lifting off from Launch Complex 39A, where facilities designed specially for the Saturn V had been constructed, on November 9, 1967 – depicted in this photograph. The original launch date was planned for late 1966, but was delayed due to myriad problems with various elements of the spacecraft, and difficulties during pre-flight testing. Also contributing to the delays was the need for additional inspections following the Apollo 1 fire that killed the first Apollo crew in January 1967. These issues delayed the flight through much of 1967. The mission splashed down in the Pacific Ocean slightly less than nine hours after launch, having achieved its objectives.Photograph credit: NASA