Shaping Steel Air Force Cadet 1st Class Isaac Perkins shapes a piece of hot steel into a knife during a physical metallurgy class at U.S. Air Force Academy in Colorado Spring, Colo., Feb. 17, 2021. SHARE: Download: Full Size (1.57 MB) Tags: Air Force Credit: Joshua Armstrong, Air Force VIRIN: 210217-F-NH566-3011M.JPG Photo Gallery