"Mortar, Out-Going: Lance Corporal G. L. Thomkins (Morristown, Pennsylvania), 19, holds bipods for a 60mm mortar and Corporal G. E. Knapp (Aumsville, Oregon), 18, drops a high explosive round down the tube in support of helicopters on the landing zone. Corporal W. P. Troy (Cleveland, Ohio), 22, adjusts the rounds on Viet Cong positions by radio for C Company, 1st Battalion, 5th Marines (official USMC photo by Lance Corporal N. J. Shannon)."
From the Jonathan F. Abel Collection (COLL/3611) at the Archives Branch, Marine Corps History Division