Apollo Agena 4 Spacecraft: (no serial number) Launch Vehicle: Atlas D/Agena B Scheduled Launch: 1 Apr 1964 Last Scheduled: 1 Aug 1960

⇑ Mission List ⇑ Designation: Apollo AA P S(S)-4 Description: 4th Apollo Atlas Agena unmanned suborbital lunar reentry simulation

Early Apollo planning included up to four Atlas Agena suborbital flights of subscale models of the Command Module to conduct aerothermodynamic and materials eveluations. Ultimately, two similar flights were undertaken on Atlas launch vehicles without upper stages. References: NASA. 1961. "Project Apollo Schedule." 20 January. HSI-16093.