The first American serviceman killed was killed by the Russians (Finland 1940).
The highest ranking American killed was Lt. Gen. Lesley McNair, killed by the US Army Air Corps.
The youngest US serviceman was 12 year old Calvin Graham, USN. He was wounded in combat and given a Dishonorable Discharge for lying about his age. (His benefits were later restored by act of Congress).
At the time of Pearl Harbor, the top US Navy command was called CINCUS (pronounced “sink us”), the shoulder patch of the US Army’s 45th Infantry division was the Swastika, and Hitler’s private train was named “Amerika”. All three were soon changed for PR purposes.
More US servicemen died in the Air Corps that the Marine Corps.
While completing the required 30 missions, your chance of being killed was 71%. Not that bombers were helpless. A B-17 carried 4 tons of bombs and 1.5 tons of machine gun ammo. The US 8th Air Force shot down 6,098 fighter planes, 1 for every 12,700 shots fired