200114-Z-NJ935-0114
U.S. Air Force Lt. Col. Kurt Duffy, an F-15 instructor pilot with the 173rd Fighter Wing in Klamath Falls, Ore., checks maintenance logs before takeoff while visiting the 162nd Fighter Wing in Tucson, Ariz., Jan 14, 2020. The F-15s help aspiring F-16 pilots by providing dissimilar air combat training or DACT, which better prepares them for duty in the operational Air Force. (U.S. Air National Guard photo by Master Sgt. Jefferson Thompson)