Air Force Chief of Staff Gen. David L. Goldfein (left) and Tech. Sgt. Daniel Keller, a combat controller in the 123rd Special Tactics Squadron, salute during the national anthem as part of an award ceremony at the Kentucky Air National Guard Base in Louisville, Ky, Aug.13, 2019. At the ceremony, Goldfein presented Keller 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)