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The August 1960 long range plan for the manned spaceflight program called for a secondd three-stage Saturn C-1 suborbital flight of an Apollo Command Module in 1964: "reentry of a developmental capsule along the lower limit of the altutude corridor at parabolic velocity," thus simulating a return from the Moon. The launch date of January 1964 is interpolated. NASA announced the redesign of the Saturn C-1 as a two-stage launch vehicle on 1 June 1961.
References:
Disher, John H. 1960. "Long Range Plan: Manned Space Flight Program." 8 August. HSI-15822.
Encyclopedia Astronautica.
Wikipedia.
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