A U.S. Air Force F-22A Raptor fighter aircraft from the 3rd Fighter Wing, Joint Base Elmendorf-Richardson, Anchorage, Alaska, intercepts a C-21 Learjet airlift aircraft from the 200th Airlift Squadron, Colorado Air National Guard, based at Peterson Air Force Base, Colo., during an air defense training exercise over Anchorage, Alaska, Aug. 30, 2017. During the exercise, the C-21 acted as a hostile threat to homeland security, necessitating a response from the local Aerospace Control Alert unit. (U.S. Air National Guard photo by Lt. Col. Derek Tate)