FORT SILL, Okla. – U.S. Air Force Staff Sgt. Joseph Sewell, 97th Security Forces Squadron, combat arms training and maintenance instructor, oils an M2 machine gun before qualifications and certifications firing at the Kerr Hill Machine Gun Range, Aug. 7, 2015. The weapons system has to be oiled before firing so that the machinery does not malfunction due to overheating caused by friction. (U.S. Air Force photo by Senior Airman Dillon Davis/Released)
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