[1] [2][3] The Apollo system differed from the Gemini Docking Mechanism in that after locking, the probe and drogue mechanism could be manually removed to allow access between the two docked craft.

[4] The Apollo docking system was used successfully in thirteen missions in Earth and lunar orbits between 1969 and 1975.

The only serious problems were experienced on Apollo 14 and Skylab 2, when the probe systems failed to capture the drogue receptacles during repeated docking attempts.

[5] This article related to the National Aeronautics and Space Administration is a stub.

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