An AC-130U “Spooky” Gunship retires to the 309th Aerospace Maintenance and Regeneration Group at Davis-Monthan Air Force Base, Arizona, Aug. 19, 2019. The AC-130U’s armament includes a 25mm Gatling gun, as well as 40mm and 105mm cannons. (U.S. Air Force photo by Airman 1st Class Jacob T. Stephens)