Fighter jets of the 113th Wing, DC Air National Guard leave a circular pattern of contrails in the sky over the flight line Eielson Air Force Base, Alaska during “Red Flag-Alaska 15-2.” Red Flag-Alaska is an air combat training exercise between Air National Guard, Active Duty and international military personnel. During the exercise, aviators at Red Flag hone their close air support, interdiction and counter-air skills in simulated combat scenarios. (U.S. Air National Guard photo by Capt. Nathan Wallin)