Tech. Sgt. Katrina Rubisch, 4th Equipment Maintenance Squadron armament maintenance supervisor (right) and Senior Airman Geoffrey Negrete, 4 EMS armament systems technician (left), inspect the barrels of an F-15E Strike Eagle 22mm gun for corrosion at Seymour Johnson Air Force Base, North Carolina, Oct. 1, 2020. Rubisch and Negrete performed an 18-month gun system inspection that includes disassembling, inspecting, cleaning and reinstalling. (U.S. Air Force photo by Airman 1st Class Kimberly Barrera)