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Only two other shuttle missions remain.

Endeavour is due to blast off April 19 with Kelly’s identical twin brother Mark at the controls. Mark is married to Rep. Gabrielle Giffords, who is recuperating from a gunshot blast to the head.

Atlantis will close out the 30-year shuttle program with a launch at the end of June.

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Online:

NASA: http://www.nasa.gov/mission_pages/shuttle/main/index.html