MacLean was a 10-year federal law enforcement officer, and U.S. Department of Homeland Security (DHS) Federal Air Marshal (FAM) with an unblemished record. In July 2003, he successfully blew the whistle on agency plans to secretly offset budget shortfalls by eliminating air marshals from long distance flights in the midst of a terrorism alert over suicide terrorist hijackings. After public congressional pressure, DHS’s plans were canceled. On April 11, 2006, the agency fired MacLean for using previously-undesignated Sensitive Security Information (SSI) in the 2003 disclosure.