Firefighters collect an envelope containing mock-Anthrax during a joint chemical, biological, radiological, nuclear and high-yield explosive (CBRNE) threat exercise at Fort Eustis, Va., Jan. 28, 2016. This was the first joint CBRNE exercise incorporating Fort Eustis and Langley Air Force Base emergency responders and safety representatives. (U.S. Air Force photo by Staff Sgt. Natasha Stannard)