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403574 01: The STS-110 crew head for the Astrovan for a ride to Launch Pad 39B for the 13th assembly flight to the International Space Station to deliver the S0 Integrated Truss Structure and Mobile Transporter (MT) April 8, 2002 at Kennedy Space Center, FL. (L, foreground to R) Mission Specialists Jerry L. Ross and Rex J. Walheim, (L, 2nd row) Mission Specialists Steven L. Smith, Lee M.E. Morin, Ellen Ochoa, Pilot Stephen N. Frick, and Commander Michael J. Bloomfield wave as the depart. The 11-day mission features four spacewalks to attach the S0 truss, which will become the backbone of the Space Station, to the U.S. Lab, "Destiny." (Photo Courtesy of NASA/Getty Images)