Senior Airman Brandon Brock, an active-duty crew chief assigned to Naval Air Station Fort Worth Joint Reserve Base, Texas, cleans an F-16 Fighting Falcon aircraft canopy before Flight May 3 at Hill Air Force Base, Utah. Brock and other Airmen from the 301st Fighter Wing were at Hill AFB participating in Combat Hammer, an air-to-ground weapons evaluation exercise. (U.S. Air Force/Paul Holcomb)