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KENNEDY SPACE CENTER, FLA. -- (From left) NASA Associate Administrator for Space Operations William Gerstenmaier; Evelyn Husband-Thompson, widow of Colonel Rick Husband, who died in the space shuttle Columbia accident; and NASA Administrator Michael Griffin pause in front of the flowers left in remembrance of the fallen heroes. Kennedy marked the NASA Day of Remembrance with special ceremonies. This year the crew of Columbia was remembered in a special way on the day that marked the fifth anniversary of the Columbia accident. Photo credit: NASA/Kim Shiflett