Slayton

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1961 Autumn. (Cancelled flight). Crew: Slayton. Program: Mercury. Slayton would probably have flown the fourth manned suborbital Mercury. But after the Russians began orbiting cosmonauts, NASA cancelled further suborbital flights. The MR-6 mission was cancelled by NASA administrator James Webb at the beginning of July, 1961.

• 1961 Jul 13 - Mercury MR-6 booster was static tested 

  The Redstone launch vehicle designated for the Mercury-Redstone 6 (MR-6) mission was static tested at the Marshall Space Flight Center to ensure satisfactory operation of the turbopump assembly.

• 1961 Jul 13 - Mercury MR-6 static engine test  Launch Vehicle: Redstone.

  Mercury-Redstone 6 was static tested for 30 seconds at Marshall Space Flight Center to ensure satisfactory operation of the turbopump assembly.

• - 1961 Autumn - Mercury MR-6 (cancelled)  Crew: Slayton. Spacecraft: Mercury. Payload: Mercury SC16. Launch Vehicle: Redstone.

  After the Russians began orbiting cosmonauts, NASA cancelled further suborbital flights. The MR-6 mission was cancelled by NASA administrator James Webb at the beginning of July, 1961.