428-GX-USN 1135577_Box 875:  Secretary of the Navy Paul R. Ignatius, (right), witnesses a demonstration of River Patrol Boat (PBR) weapons.  Gunner’s Mate Second Class Vincent Rincan, (left), mans the Mark 18 Rapid Fire Grenade Launcher while Lieutenant Commander Bob L. Peterson, Commander, Bassac River Patrol Group III, holds the M-79 single-shot grenade launcher, Republic of Vietnam, October 1968.  Photographed from reference card.  (2015/12/22).
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