Katherine Hammack (left), assistant secretary of the

Katherine Hammack (left), assistant secretary of the Army for Installations, Energy and Environment, and Brig. Gen. Barbara L. Owens, deputy commanding general, U.S. Army Human Resources Command, unveil one of five Energy Star awards at the command's headquarters at Fort Knox, Ky., May 5. HRC's five office buildings were recognized for using 35 percent less energy and generating 35 percent fewer greenhouse gas emissions than others in its classification for two years running, contributing to the Army Net Zero goal of energy sustainability and security. (Photo by Stephen Moore)