Gemini 8Gemini 8, carrying David Scott and Neil Armstrong, lifts off on a mission to fulfill the Agena booster rendezvous and docking goal originally assigned to Gemini 6. After docking with the Agena vehicle a few hours into the flight, Gemini 8 begins an unplanned, uncontrolled roll, and the crew initially believe it to be an issue with the Agena. But after undocking from the Agena, the Gemini capsule spins even faster out of control until Armstrong, using maneuvering thrusters reserved for reentry, cancels out the roll. Mission rules require an immediate return to Earth, and the astronauts splash down safely, barely 11 hours after liftoff.