MCGHEE TYSON AIR NATIONAL GUARD BASE, Tenn. - Workers excavate behind a safety banner here May 27, 2015, inside the construction boundary at the I.G. Brown Training and Education Center campus. The contractor excavated more than 10,000 cubic yards of soil since leaders broke ground last summer for a new complex. Scheduled completion is August 2016. (U.S. Air National Guard photo by Master Sgt. Mike R. Smith/Released)