Aaron Sherman, 733d Civil Engineer Division Fort Eustis Fire Department station chief, guides his team during an iteration of a training exercise on Joint Base Langley-Eustis, Virginia, Nov. 9, 2020. During fires, smoke obscures vision and renders the landscape practically invisible, leading firefighters to rely on their senses, their teammates and technological capabilities to navigate through the area. (U.S. Air Force photo by Staff Sgt. Joshua Magbanua)