Stock Photo - A copy of the just-released Columbia Accident Investigation Board (CAIB) report rests on a conference table at NASA Headquarters in Washington, D.C. Retired U.S. Navy Admiral Harold Gehman, Chairman of the CAIB, earlier presented the results of the panel's investigation to NASA Administrator Sean O'Keefe. The CAIB completed the report late last week after spending nearly seven months investigating the technical facts of the Feb. 1 accident and interviewing hundreds of NASA engineers and other agency employees. Administrator O'Keefe has pledged to return the Space Shuttle to safe flight when the agency demonstrates it's 'fit to fly.'