Conversation so far:
What branch of military did Bill Edwards (American football coach) serve in?
Having built a strong record at Western Reserve.
What is the Western Reserve?
universities.
What year did he graduate?
CANNOTANSWER.
When did he begin coaching?
hired in February 1941.
What team did he first coach for?
Lions.

Question: How long did he coach for the lions?
Self-contained rewrite: How long did Bill Edwards coach for the lions?