U.S. Air Force Staff Sgt. Geoffrey Range, 633rd Civil Engineer Squadron firefighter, dons a helmet during a chemical, biological, radiological, nuclear and high-yield explosives exercise at Langley Air Force Base, Va., March 26, 2015. The exercise tested base emergency response teams ability to react to CBRNE threats. (U.S. Air Force photo by Senior Airman Kayla Newman/Released)(

U.S. Air Force firefighters prepare for a chemical, biological, radiological, nuclear and high-yield explosives exercise at Langley Air Force Base, Va., March 26, 2015. Emergency response teams were tested on the execution of required procedures to eliminate a CBRNE threat. (U.S. Air Force photo by Senior Airman Kayla Newman/Released)

U.S. Air Force Staff Sgt. Geoffrey Range, 633rd Civil Engineer Squadron firefighter, instructs a group of evacuees during a simulated chemical, biological, radiological, nuclear and high-yield explosive threat during an exercise at Langley Air Force Base, Va., March 26, 2015. The exercise tested Joint Base Langley-Eustis personnel’s ability to respond to preplanned, indiscriminate use of CBRNE weapons aimed the installation. (U.S. Air Force photo by Senior Airman Kayla Newman/Released)

U.S. Air Force firefighters construct a decontamination station at Langley Air Force Base, Va., March 26, 2015. Emergency responders participated in a chemical, biological, radiological, nuclear and high-yield explosive threat exercise and were tested on their ability to plan, organize, train and respond to threats. (U.S. Air Force photo by Senior Airman Kayla Newman/Released)

A U.S. Air Force Airman gets his vital signs checked prior to donning a hazardous material suit during a chemical, biological, radiological, nuclear and high-yield explosive threat exercise at Langley Air Force Base, Va., March 26, 2015. During the exercise, participants created a contamination control center, implemented an incident scene control and provided logistical and administrative support. (U.S. Air Force photo by Senior Airman Kayla Newman/Released)

U.S. Air Force firefighters participate in a chemical, biological, radiological, nuclear and high-yield explosive threat exercise at Langley Air Force Base, Va., March 26, 2015. The exercise tested Joint Base Langley-Eustis personnel’s ability to react and respond to a potential CBRNE threat. (U.S. Air Force photo by Senior Airman Kayla Newman/Released)

A U.S. Air Force Airman tests for simulated hazardous material during a chemical, biological, radiological, nuclear and high-yield explosive threat exercise at Langley Air Force Base, Va., March 26, 2015. The exercise tested emergency personnel’s ability to respond and contain a CBRNE threat on the installation. (U.S. Air Force photo by Senior Airman Kayla Newman/Released)

U.S. Air Force Airmen prepare to enter a decontamination zone during a simulated chemical, biological, radiological, nuclear and high-yield explosive threat exercise at Langley Air Force Base, Va., March 26, 2015. Airmen participating in the exercise demonstrated the proper steps in responding to a CBRNE threat. (U.S. Air Force photo by Senior Airman Kayla Newman/Released)

A U.S. Air Force Airman goes through a decontamination station during a simulated chemical, biological, radiological, nuclear and high-yield explosive threat exercise at Langley Air Force Base, Va., March 26, 2015. Emergency responders were tasked with safely evacuating personnel, setting up a decontamination station, entering a contaminated zone and mitigating a possible threat. (U.S. Air Force photo by Senior Airman Kayla Newman/Released)