Lt. Col. John L. Hudson (Left), U.S. Army Corps of Engineers Nashville District commander, presents Maj. Timothy E. Nix with a ukulele May 14, 2015 as a symbol of his time working with the Nashville District in Music City. Nix worked primarily as a project engineer on the $19.5 million site preparation work at the Y-12 National Security Complex in Oak Ridge, Tenn. The Corps began construction in June 2013 and culminated its work in January 2015. (USACE photo by Leon Roberts)