Imjin river valley, South Korea, Mar. 2, 2002: Army Pvt. Jason Rivas, a bridge crewmember on a bridge-erection boat, keeps in position the bays, which form the bridge, at the Army Training Evaluation Program in South Korea. What appears to be fog is actually smoke, created with smoke track vehicles of the 4th Chemical Company, to block the bridge building activity from enemy view and protect it against aircraft and artillery.

Read the full story on the training and see additional photos here.