Airmen from the 926th Aircraft Maintenance Squadron watch as an F-35A Lightning II pilot assigned to the 422nd Test and Evaluation Squadron performs pre-flight checks before launch at Nellis Air Force Base, Nevada, Sept. 21, 2021. The 442nd and 59th Test and Evaluation Squadrons led Air Combat Command’s portion of a nuclear design certification test with maintenance support from the 57th Aircraft Maintenance Squadron and Bolt Aircraft Maintenance Unit. (U.S. Air Force photo by Airman 1st Class Zachary Rufus)