National Transportation Safety Board
Assistance to other domestic agencies In addition to assisting the Department of Justice in criminal investigations, the NTSB has also assisted the National Aeronautics and Space Administration (NASA) in its investigations of both the Challenger and the Columbia Space Shuttle disasters.  The NTSB also provides assistance on request to the U.S. military in its investigation of military incidents within the realm of the NTSB's expertise, such as the crash of an Air Force transport plane in former Yugoslavia that took the lives of more than 30 Americans, including Commerce Secretary Ron Brown.