Capt. Justin Valentine (right), 100th Communication Squadron flight commander for defensive cyber operations, Tech Sgt. Michael Markus (left), 48th CS client systems technician, and Airman 1st Class Brian Stahl (center), 422nd CS noncommissioned officer in charge of cyber operations, investigate and configure firewall rules for a training scenario as part of exercise TACET VENARI, held at the U.S. Air Forces in Europe Regional Training Center, Ramstein Air Base, Germany, Mar. 8, 2019. The exercise focused on training mission defense teams the tactics, techniques and procedures necessary to defend the command’s mission relevant terrain and weapon systems. (U.S. Air Force photo by Master Sgt. Renae Pittman)