Senior Airman Christina Smith, a crew chief assigned to the 301st Fighter Wing, Naval Air Station Fort Worth Joint Reserve Base, Texas, performs pre-flight maintenance on an F-16 Fighting Falcon aircraft May 3 at Hill Air Force Base, Utah. The F-16s were at Hill AFB and the Utah Test and Training Range participating in Combat Hammer, an air-to-ground weapons evaluation exercise. (U.S. Air Force/R. Nial Bradshaw)