A sign depicts a large area of rubble, known as the “hot zone”, where Colorado National Guard Chemical, Biological, Radiological, and Nuclear Enhanced Response Force Package members practice an emergency exercise March 8, 2014, in Erie, Colo. The CERFP team spends one weekend every three months training in an emergency exercise to refine their skills in search and rescue, decontamination and medical procedures. (U.S Air Force photo by Airman 1st Class Samantha Saulsbury/Released)