A 28th Aircraft Maintenance Squadron technician at Ellsworth Air Force Base, S.D., conducts pre-flight maintenance on a B-1B Lancer prior to a 29-hour, non-stop Dynamic Force Employment mission to the U.S. European Command area of responsibility, May 28, 2020. The dynamic force employment mission showcases the B-1’s ability to assure NATO allies and partners, deter enemy aggression, and provide a strategic bomber presence anywhere around the globe. (U.S. Air Force photo by Senior Airman Nicolas Z. Erwin)