Stock Photo - NASA Administrator Sean O'Keefe (left) reads the cover letter of the Columbia Accident Investigation Board's (CAIB) just-released report to an audience consisting of staff members at NASA Headquarters in Washington, D.C. Those pictured include Bryan D. O'Connor and Dr. Michael A. Greenfield. Retired U.S. Navy Admiral Harold Gehman (not pictured), CAIB chairman, earlier presented the results of the panel's investigation to Mr. 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.'