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Vandenberg conducts Northstar exercise
VANDENBERG AIR FORCE BASE, Calif. -- Looking for opposition forces, Senior Airman Derek Siebert, a 30th Security Forces Squadron member, takes cover during the Northstar exercise here Thursday, Sept. 23, 2010. The exercise trained Airmen during a simluated deployed environment, practicing their skills and response time. (U.S. Air Force photo/Senior Airman Andrew Satran)

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