Firefighters prepare to build a decontamination station during a joint chemical, biological, radiological, nuclear and high-yield explosive threat exercise at Fort Eustis, Va., Jan. 28, 2016. The exercise tested Langley Air Force Base and Fort Eustis first responders on their ability to communicate with one another while eliminating the CBRNE threat. (U.S. Air Force photo by Staff Sgt. Natasha Stannard)