Active-duty Tech. Sgts. Mike McKinney, foreground, and James Underwood, both 301st Fighter Wing, Naval Air Station Fort Worth Joint Reserve Base, Texas, build GBU-38 and GBU-54 bombs April 26 at Hill Air Force Base, Utah. McKinney and Underwood participated in Combat Hammer, an air-to-ground weapons evaluation exercise which collects and analyzes data on the performance of precision weapons and measures their suitability for use in combat.

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