Gemini 8

Gemini 8 was the sixth crewed spaceflight in NASA's Gemini program. It was launched on March 16, 1966, and was the 14th crewed American flight and the 22nd crewed spaceflight overall. The mission conducted the first U.S. docking of two spacecraft in orbit, but also suffered the first critical in-space system failure of a U.S. spacecraft. Astronauts Neil Armstrong and David Scott temporarily lost attitude control of their craft during the docking procedure, which threatened their lives and resulted in an immediate abort of the mission. The crew returned to Earth safely.

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