 These consisted of III Amphibious Corps (1st and 6th Marine Divisions, with 2nd Marine Division as an afloat reserve), and XXIV Corps (7th, 77th, 96th and 27th Infantry Divisions).On April 28, 1945, PFC Ruiz's unit was pinned down by machine gun fire coming from a camouflaged Japanese pillbox and was unable to advance to its assigned objective.Ruiz, on his own initiative, charged the pillbox under a hail of machine gun fire.