Cyber Shield Persistent Cyber Training Environment (PCTE) range lead, Chief Warrant Officer 3 Jeremy Marroncelli, talks about the range cyber warriors are operating on during exercise Cyber Shield 2021. The PCTE platform allows defensive cyber operations elements and Cyber Protection Teams to practice real-world threats on an internal cyber range at the unclassified level. Cyber Shield is the largest unclassified cyber training exercise in the Department of Defense, involving approximately 800 military, government, industry and other experts from across the nation. (Video by Sgt. Jeffrey Reno, Joint Force Headquarters - Illinois National Guard Public Affairs)