General Lester L. Lyles entered the United States Air Force in 1968. Over the course of a distinguished career Lyles has served as program director of the Medium-Launch Vehicles Program and Space-Launch System offices (during the recovery from the Challenger accident); vice commander and then commander of Ogden Air Logistics Center; commander of the Space and Missile Systems Center; director of the Ballistic Missile Defense Organization; vice chief of staff at Headquarters U.S. Air Force; and as commander of Air Force Materiel Command. Lyles has received the Defense Distinguished Service Medal, the Distinguished Service Medal, the Defense Superior Service Medal, and the Legion of Merit with oak leaf cluster. He chairs the board of KBR Corp. and is a director of General Dynamics Corp. and the Battelle Memorial Institute. He also is chair of USAA.