Brig. Gen. Jeffrey Pennington and Chief Master Sgt. Cynthia Villa, Fourth Air Force commander and command chief, take part in Military Operations in Urban Terrain Training with the 512th Security Forces Squadron Oct. 17, 2020, at the Tactics and Leadership Nexus on Dover Air Force Base, Delaware. The 512th AW is a subordinate unit of the 4th AF, which is headquartered at March Air Reserve Base, California. (U.S. Air Force photo by Tech. Sgt. Zachary Cacicia)