Shuttle Program Manager Ron Dittemore third from left and Ralph Roe examine a piece of debris from Columbia.

Shuttle Program Manager Ron Dittemore (third from left) and Ralph Roe (fourth from left), with the Orbiter Work Group, JSC, examine a piece of debris from Columbia. A Columbia Restoration Project Team is examining pieces and attempting to reconstruct the orbiter as part of the investigation into the accident that caused the destruction of Columbia on its return to Earth from mission STS-107. To date, four shipments have arrived from Barksdale AFB, Shreveport, La., the collection point for debris.