On June 25th, it collided with an unmanned Progress service vehicle during a test of a new docking technique.

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As Gemini 8 Command Pilot, his March 16, 1966 mission with Pilot David Scott entailed complex rendezvous and docking maneuvers with an unmanned Agena target vehicle which ultimately required recovery from a harrowing, out-of-control spacecraft roll.

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The Russian docking mechanism had to be taken off the vehicle so a faulty switch could be replaced.

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