U.S. Army Staff Sgt. Robert Prieto, 221st Military Training Detachment squad leader, treks through a forest during a land navigation exercise at Joint Base Langley-Eustis, Virginia, Oct. 21, 2020. The Fort Eustis installation covers a massive land area and contains vast expanses of forests and marshland. (U.S. Air Force photo by Staff Sgt. Joshua Magbanua)