U.S. Air Force Airmen from the 1st Maintenance Squadron conventional unit, load 20 mm rounds on to a universal ammunition loading system at Joint Base Langley-Eustis, Virginia, May 1, 2018. The rounds are shot from an F-22 Raptor with an M16A2 20-millimeter cannon. (U.S. Air Force photo by Airman 1st Class Anthony Nin Leclerec)