Apollo 4 was the unmanned first flight of the first and second stages of the
Saturn V (the S-IVB stage had flown on the
Saturn IB[?] launch vehicles), as well as the first launch of the complete Saturn V, the first restart of the S-IVB in orbital flight, the first liftoff from Complex 39, the first flight test of the Block II command module heatshield, and the first flight of even a simulated lunar module.
Preceded by: Apollo 1 - Followed by: Apollo 5
See Apollo program.
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