By the end of World War II in 1945, 407,316 American servicemen had been killed. The largest number of losses were in the U.S. Army, with 318,274 American soldiers killed in action.
The Navy experienced the second-largest number of soldiers killed in action at 62,614, with the Marines losing 24,511 and the Coast Guard 1,917. The U.S. Merchant Marines also experienced losses during World War II, with 5,662 killed, 845 of them at sea, and another 4,780 missing and presumed dead. Thirty-seven Merchant Marines died as prisoners of war. Out of every 1,000 servicemen between 1941 and 1945, 8.6 were killed in action, 3 died from other causes and 17.7 received non-fatal wounds while in combat, according to The National WWII Museum.