U.S. Air Force Senior Airman Enrique Alvarez, 380th Expeditionary Aircraft Maintenance Squadron RQ-4 Global Hawk avionics specialist, performs a preflight checklist on a computer at Al Dhafra Air Base, United Arab Emirates, March 25, 2021. Alvarez performs pre, thru and post flight inspections alongside RQ-4 crew chiefs to ensure mission success. (U.S. Air Force photo by Senior Airman Bryan Guthrie)