Mary Mapes produced a segment for "60 Minutes Wednesday" that aired criticism of President George W. Bush's military service, supported by documents purportedly from the files of Bush's commanding officer, the late Lieutenant Colonel Jerry B Killian. Those documents had been delivered to CBS from Bill Burkett, who was a retired Lt. Colonel with the Texas Army National Guard. During the segment, Dan Rather asserted that the documents had been authenticated by document experts, but ultimately, CBS could neither confirm nor definitively refute their authenticity. Moreover, CBS did not have any original documents, only faxed copies, as Burkett claimed to have burned the originals.