U.S. Air Force F-15C Eagle fighter jets from Massachusetts Air National Guard’s 104th Fighter Wing, and Royal Canadian air force CF-18 fighter jets from 3 Wing, Bagotville, Quebec, fly in formation with a Pennsylvania Air National Guard KC-135 Stratotanker from the 171st Air Refueling Wing during a Continental U.S. North American Aerospace Defense Command Region and Canadian NORAD Region cross-border demonstration, April 23, 2020. Aircrew and members of the ANG and RCAF practiced tactical-intercept skills in the air-defense exercise designed to reinforce interoperability across the United States and Canadian border. (U.S. Air National Guard courtesy photo by Capt. Kyle Tufts)