Okinawa was the largest amphibious invasion of the Pacific campaign and the last major campaign of the Pacific War. More ships were used, more troops put ashore, more supplies transported, more bombs dropped, more naval guns fired against shore targets than any other operation in the Pacific. More people died during the Battle of Okinawa than all those killed during the atomic bombings of Hiroshima and Nagasaki. Casualties totaled more than 38,000 Americans wounded and 12,000 killed or missing, more than 107,000 Japanese and Okinawan conscripts killed, and perhaps 100,000 Okinawan civilians who perished in the battle. The battle of Okinawa proved to be the bloodiest battle of the Pacific War. Thirty-four allied ships and craft of all types had been sunk, mostly by kamikazes, and 368 ships and craft damaged. The fleet had lost 763 aircraft. Total American casualties in the operation numbered over 12,000 killed [including nearly 5,000 Navy dead and almost 8,000 Marine and Army dead] and 36,000 wounded. Navy casualties were tremendous, with a ratio of one killed for one wounded as compared to a one to five ratio for the Marine Corps. Combat stress also caused large numbers of psychiatric casualties, a terrible hemorrhage of front-line strength. There were more than 26,000 non-battle casualties.