Stock Photo - FILE: In this photo released by NASA,, the STS-121 crew displays the spirit of the Fourth of July holiday with their flags and their eagerness to launch as they stride out of the Operations and Checkout Building at the Kennedy Space Center, Florida on July 4, 2006. Leading the way are Pilot Mark Kelly (left) and Commander Steven Lindsey (right). Behind them are Mission Specialists (second row) Lisa Nowak and Michael Fossum; (third row) Stephanie Wilson and Piers Sellers; and (at the rear) Thomas Reiter, who represents the European Space Agency. .Mandatory Credit: Kim Shiflett - NASA via CNP | usage worldwide. - Kennedy Space Center/Florida/United States of America