U.S. Air Force Airman 1st Class Luke Calip, an emergency management specialist, and Staff. Sgt. Brian Tripp, an Emergency Management noncommissioned officer, both with the 633rd Civil Engineer Squadron Emergency Management flight, prepare to exit a simulated contaminated area at Joint Base Langley-Eustis, Virginia, Oct. 10, 2019. Calip and Tripp worked together to test an unknown substance to determine if it was a Chemical, Biological, Radiological or Nuclear agent. (U.S. Air Force photo by Senior Airman Delaney Gonzales)