Air Force Chief of Staff Gen. David L. Goldfein (left) pumps his fist during the playing of the Air Force Song at a ceremony held at the Kentucky Air National Guard Base in Louisville, Ky, Aug.13, 2019. Earlier in the ceremony, Goldfein presented Tech. Sgt. Daniel Keller (right), a combat controller in the 123rd Special Tactics Squadron, with the Air Force Cross, which Keller earned for valor on the battlefield in Afghanistan. (U.S. Air National Guard photo by Staff Sgt. Joshua Horton)