Cpl. Lee Walls, a Port St. Lucie, Fla., native and

Cpl. Lee Walls, a Port St. Lucie, Fla., native and navigator with Combat Logistics Regiment 2, Regional Command (Southwest), talks to his vehicle operator while negotiating a desert route during a convoy in Helmand province, Afghanistan, Sept. 16, 2013. Walls helps plot courses around danger areas and impassible obstacles as he guides convoys of more than 30 vehicles through challenging desert terrain features.