A U.S. Air Force F-16 Fighting Falcon fighter aircraft,

A U.S. Air Force F-16 Fighting Falcon fighter aircraft, assigned to the 18th Aggressor Squadron at Eielson Air Force Base, Alaska, leaves a hangar into minus 9-degree temperatures Dec. 1, 2015, for a sortie in the Joint Pacific Alaska Training Range Complex (JPARC). The Aggressors fly rain or shine, barring extreme inclement weather, to provide unparalleled training to U.S. and partner nations in the JPARC, the world’s largest instrumented air, ground and electronic combat training range. (U.S. Air Force photo by Staff Sgt. Shawn Nickel/Released)