A gas obstacle course at the Chemical Warfare School in the Edgewood Arsenal in Maryland, United States. A trainee squad at Station No.3 in a woody terrain during the gas obstacle course. An instructor and trainees standing beside a canoe near trees. The instructor tells the members of the squad to identify duds (unexploded ordnance) since the enemy used some agents of an unknown type in shells. The members of the squad walk through the woody terrain trying to identify duds. One of the trainees identifies a shell in a dug. The trainee jotting down notes. One of the officers sprays CND from a chemical cylinder into the air. The trainees in the terrain identify all the dugs.
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