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Technical Sgt. Bart Davidson, 191st Maintenance Squadron, prepares to cut an opening in the floor of a KC-135 Stratotanker at Selfridge Air National Guard Base, Mich., Jan. 16, 2013. The KC-135, assigned to the 127th Air Refueling Group of the Michigan Air National Guard, was being prepared to serve as a platform for testing a prototype of a new aircraft defense system. (Air National Guard photo by John S. Swanson)
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