An F-15EX Eagle II Fighter Jet assigned to the 40th Flight Test Squadron, Eglin Air Force Base, Florida, taxis before taking off from Nellis Air Force Base, Nevada, Oct. 21, 2021. The Air Force’s newest aircraft will conduct test and evaluation missions to determine effectiveness and suitability of accomplishing its air-to-air mission for future use in our Air Force. (U.S. Air Force photo by William R. Lewis)