KINGSPORT, Tenn. (WJHL) — The Holston Army Ammunition Plant (HSAAP) in Kingsport is undergoing modernization efforts in its natural gas-fired steam plant, fluid energy mill building and Weak Acetic Acid Recovery Plant (WAARP). According to a release by the U.S. Army, this is part of a 15-year plan that aims to modernize the Organic Industrial Base. […]