Emergency responders stand by for further instruction during the Panther View Exercise 19-04, Nov. 19, 2019, at Buckley Air Force Base, Colo. Both active shooter and Chemical, Biological, Radiological, Nuclear and Explosives (CBRNE) simulations were conducted to mimic real-world problems and test the readiness of first responders on a military installation. (U.S. Air Force photo by Airman 1st Class Joshua T. Crossman)