U.S. Air Force Staff Sgt. Michael Woronec, a crew chief with the 180th Fighter Wing, inspects the exhaust of an F-16 Fighting Falcon on the flight line of the Alpena Combat Readiness Training Center in Alpena, Michigan, Aug. 21, 2014. The 180th Fighter Wing deployed to the CRTC to participate Operation Northern Strike, a joint exercise led by the National Guard that demonstrates the combined power of the air and ground forces. (Air National Guard photo by Staff Sgt. Amber Williams/Released)