Luke AFB F-35A Lightning II at Dover AFB
An F-35A Lightning II from Luke Air Force Base, Arizona, takes off from Dover AFB, Delaware, Feb. 19, 2020. Two F-35As recently returned from participating in the HX Challenge held near Tampere, Finland. During the HX Challenge, five different aircraft were tested for seven days, in Finnish weather conditions, to assess their ability to replace the current fleet of Finnish air force FA-18C and FA-18D Hornets. (U.S. Air Force photo by Senior Airman Christopher Quail)