Conversation so far:
what was the name given to american forces in europe
The U.S. forces that were sent to Europe during World War I were called the American Expeditionary Forces. The nickname for U.S. soldiers during the war was doughboy.
why was the american expeditionary forces called doughboyds
It’s unknown exactly how U.S. service members in World War I came to be dubbed doughboys.

Question: what years was the formation active
Self-contained rewrite: what years was the american expeditionary forces active