NASHVILLE, Tenn. (Jan. 25, 2017) –The U.S. Army Corps of Engineers Great Lakes and Ohio River Division commander, Brig. Gen. Mark Toy visited the Chickamauga Lock Replacement Project in Chattanooga, Tenn., today. He also toured the U.S. Department of Energy Y-12 National Security Complex in Oak Ridge, Tenn., to see the new Construction Support Building project.