Air Force Chief of Staff Gen. David L. Goldfein, left, shakes hands with U.S. Air Force Force Lt. Gen. Brad Heithold, the Principal Deputy Director, Cost Assessment and Program Evaluation, Office of the Secretary of Defense in Washington, D.C, during a retirement ceremony at Hurlburt Field, Fla., June 29, 2018. Heithold retired after 44 years of service. (U.S. Air Force photo by Senior Airman Joseph Pick)