Last week, Getty News Service published a series of photographs of a foot patrol near the Kajaki Dam, a landmark in northern Helmand province, Afghanistan, that provides hydroelectric power.  Third Battalion, 12th Marines, an artillery unit out of Camp Pendleton, Calif., has been assigned the area for several months, protecting a potential Taliban target. This series of photographs was uncommon, though, because it includes scenes from the last foot patrol one Marine ever participated in. Cpl. Jorge Villarreal, a motor vehicle operator, died after stepping on an improvised explosive device, becoming one of the 19 casualties sustained by a Marine unit…