Augmented Target Docking Adapter
A backup vehicle for the ATV, known as the Augmented Target Docking Adapter (ATDA), was constructed by McDonnell from the docking target and the Gemini reentry attitude control thruster assembly for use if the primary ATV failed. The ATDA was designed to allow docking, but lacked the propulsion capability of the Agena rocket. The ATDA was used on Gemini 9A, after the Atlas-Agena launch vehicle failed. However, the Gemini 9 crew could not dock with the ATDA because the nose cone shroud failed to separate properly.
Read more about this topic: Agena Target Vehicle
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