Apollo-Saturn 201 (AS-201), the first Saturn IB launch vehicle developed by NASA’s Marshall Space Flight Center (MSFC), lifts off from Cape
Canaveral, Florida, at 11:12 a.m. on Feb. 26, 1966. The AS-201 mission
was an unmanned suborbital flight to test the Saturn 1B launch vehicle
and the Apollo Command and Service Modules. This was the first flight of
the S-IB and S-IVB stages, including the first flight test of the
liquid-hydrogen/liquid oxygen-propelled J-2 engine in the S-IVB stage.
During the thirty-seven minute flight, the vehicle reached an altitude
of 303 miles and traveled 5,264 miles downrange.

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