 Because of his experience with military criminal issues, Sigmon was appointed as Chief Appellate Counsel for the Air Force.In that position, he was responsible for ensuring that criminal convictions were affirmed in the military appellate courts.After terrorists attacked America on September 11, 2001, Sigmon was personally selected to also serve as an Executive Officer to the Air Force Crisis Action Team which served as the 24-hour, 365-day nerve center of worldwide Air Force operations at the Pentagon.