The Crew of the Space Shuttle Endeavour departs

Space Shuttle Endeavour Commander Mark Kelly (right) waves after departing with his crew and boarding the Astrovan on their way to the launchpad for Endeavour's last flight at Kennedy Space Center, Florida on April 29, 2011. The launch attempt was scrubbed minutes later. Behind Kelly is Pilot Greg Johnston and mission specialists Mike Finke and Roberto Vittori (left). Kelly is the husband of Arizona Congresswoman Gabrielle Giffords, who was recovering from an assassination attempt and at the Cape to watch the possible liftoff. UPI/ Pat Benic