Officers aboard Quiet Fast Boats during a patrol in the Bassac River, Vietnam. An M-60 machine gun in the foreground. U.S. Lieutenant Lemon and Lieutenant Riedel man their M-60 machine gun in the stern section of the QFB ( Quiet Fast Boats). Heavy foliage along the riverbank. One of the officers takes a paddle from the boat and puts it over the side. Chief Petty Officer Briggs is the coxswain of the boat. Lieutenant Lemon and Lieutenant Riedel man their M-60 machine gun in the background. Soldier fires a Mk 18 Mod 0 grenade launcher. Closeup view of the Mk 18 grenade launcher as it is fired. African American soldier pours river water on engines. Helicopters in flight overhead. (Vietnam War period).