Airman 1st Class Ryan O'Keefe, 11th Civil Engineer Squadron heavy equipment operator, tries on an M50 gas mask during a Chemical, Biological, Radiological and Nuclear Defense (CBRN) Survival Skills Training course on Joint Base Andrews, Md., Feb. 14, 2013. The M50 is a Joint Service General Purpose Mask and is standard DOD wide, a vast improvement to the previous M40. (U.S. Air Force photo/Airman 1st Class Nesha Humes)(Released)

Airmen apply M9 Chemical Agent Detector tape to their into Mission Oriented Protective Posture (MOPP) gear during a Chemical, Biological, Radiological and Nuclear Defense (CBRN) Survival Skills Training course on Joint Base Andrews, Md., Feb. 14, 2013. The M9 is tape turns red indicating the presence nerve or blister agent. (U.S. Air Force photo/Airman 1st Class Nesha Humes)(Released)

Students examine M8 Chemical Agent Detector Paper for the presence of liquid chemical agents during a Chemical, Biological, Radiological and Nuclear Defense (CBRN) Survival Skills Training course on Joint Base Andrews, Md., Feb. 14, 2013. M8 paper turns green, red or yellow depending on the agent detected. (U.S. Air Force photo/Airman 1st Class Nesha Humes)(Released)

Post Attack Reconnaissance (PAR) team members simulate bleaching their hands and feet during a Chemical, Biological, Radiological and Nuclear Defense (CBRN) Survival Skills Training course on Joint Base Andrews, Md., Feb. 14, 2013. The PAR team must go through a Zone Transition Point to get from a contaminated to uncontaminated zone. (U.S. Air Force photo/Airman 1st Class Nesha Humes)(Released)

Staff Sgt. Eric Reist, 11th Civil Engineer Squadron emergency management training journeyman, instructs a Chemical, Biological, Radiological and Nuclear Survival Skills Training (CBRN SST) course on Joint Base Andrews, Md., Feb. 14, 2013. CBRN SST is taught to all members deploying to or changing station to a medium or high-threat area. (U.S. Air Force photo/Airman 1st Class Nesha Humes)(Released)

Airman 1st Class Ryan O'Keefe, 11th Civil Engineer Squadron heavy equipment operator and Staff Sgt. Joseph Romero, 11th Command Post senior controller, changes into Mission Oriented Protective Posture (MOPP) Level four during a Chemical, Biological, Radiological and Nuclear Defense (CBRN) Survival Skills Training course on Joint Base Andrews, Md., Feb. 14, 2013. The students have a goal of one minute to go from MOPP level two to four. (U.S. Air Force photo/Airman 1st Class Nesha Humes)(Released)