U.S. Air Force Master Sgt. Todd Pluff, 633rd Security Forces Squadron chief of standardization and evaluations, prepares for an exercise with Master Sgt. Nathan Shaw, 633rd SFS Flight chief, at Joint Base Langley- Eustis, Va., Feb. 22, 2017. The exercise was conducted by the 633rd Air Base Wing Inspector General’s office to test how the installation would react to a chemical, biological, radiological, nuclear and explosives emergency. (U.S. Air Force photo/Airman 1st Class Tristian Biese)