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A U.S. Air Force Airman, acting as a spotter, does calculations to communicate with his shooter where to aim Dec. 11 2018, at Camp Robinson, Arkansas. The spotter has a specific formula, which uses humidity, wind, temperature and other environmental factors when calculating where a shooter should aim to hit a target. (U.S. Air Force photo by Airman 1st Class Kristine M. Gruwell)
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