Green classroom
MCGHEE TYSON AIR NATIONAL GUARD BASE, Tenn. - Tech. Sgt. Donald O. Noel, instructor, discusses social media do's and don't's in the military with NCO Academy Class 14-5, B-flight, on the I.G. Brown Training and Education Center campus here, May 9, 2014. (U.S. Air National Guard photo by Master Sgt. Kurt Skoglund/Released)

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Photo by: Master Sgt. Kurt SkoglundReleased |  VIRIN: 140509-Z-II695-001.JPG