Mike Leinbach shows some of the debris from Space Shuttle Columbia to former payload specialist Dr. Roger Crouch.

In the RLV Hangar at KSC, Shuttle Launch Director Mike Leinbach (left) shows some of the debris from Space Shuttle Columbia to former payload specialist Dr. Roger Crouch (center) and NASA Chief of Staff and White House liaison Courtney Stadd. The search of more than 500,000 acres of primary recovery area for Columbia material has passed the halfway mark. To date about 28 percent of Columbia, by weight, has been delivered to the hangar.