Citizen Airmen from the 142nd Aircraft Maintenance Squadron, Portland Air National Guard Base, Ore. service an F-15 Eagle during Checkered Flag, November 12, 2019, Tyndall Air Force Base, Fla. Checkered Flag is a multi-airframe, joint-service exercise which enables pilots to carry out complex air-to-air combat scenarios. (U.S. Air National Guard photo by Tech. Sgt. Steph Sawyer, 142nd Fighter Wing Public Affairs)