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Rocket and rocket engine development takes years. The F-1 was first test-fired as a complete unit in 1959, and completed flight rating tests in 1964, and the first Saturn V flew in 1967.
Aerojet's 260-inch SRB was first test-fired in 1965. The third test in 1967 unexpectedly ejected the rocket nozzle toward the end of the burn, spewing corrosive material ...
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