Microphones are set to detect if munitions hit their target at Poinsett Electronic Combat Range, Sumter, S.C., Sept. 4, 2014. When a bullet passes through the sound range, it breaks the sound barrier and the microphones record it, tallying an approximate number of hits and misses. (U.S. Air Force photo by Airman 1st Class Diana M. Cossaboom/Released)
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