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Col. Devin Pepper, 21st Operations Group commander, hands the 12th Space Warning Squadron guidon to Lt. Col. Carl Bottolfson at a change of command ceremony, June 8, 2017, at Thule Air Base, Greenland. The 12th SWS provides critical, real-time warning of ballistic missile attacks against North America and detects, tracks and identifies earth-orbiting objects in support of U.S. Strategic Command's space control mission. (Courtesy Photo)
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