"Lightweight, speedy, maneuverable Boston Whaler boats do river patrol duty in Vietnam. They overtake and inspect boats for Viet Cong weapons and supplies." Tracking shot U.S. soldiers riding in speedboat along river in Vietnam. River patrol. Panning MS American soldiers on boat, one soldier wearing communications headset. TLS American patrol boat approaching sampan piloted by Vietnamese men. MSs soldiers searching the boat's cargo hold for contraband. MS soldier using land mine detector, scanning deck. Tracking TLS speedboat moves on, away from cam.