Answer:
According to the data that we have around 407,000 American died in the war, among which almost 300 thousands died on the battlefield.
On the other side, around 16.5 million Americans served during the war and most of them returned home after the war.
Step-by-step explanation:
It is interesting that although never so many Americans participated in a war, it wasn't the deadliest conflict for them, as more Americans died during the Civil War. According to researches that we have more than 300 thousands WW2 are still alive today.