Conversation so far:
when was the last time seahawks lost at home
when did the seattle seahawks join the nfl
The Seattle Seahawks joined the NFL in 1976 as an expansion team.
what are the seattle seahawks' fans called
The Seattle Seahawks fans have been referred to collectively as the 12th Man, 12th Fan, or 12s.
who is the head coach of the seattle seahawks
Pete Carroll is the head coach and executive vice president of the Seattle Seahawks of the NFL

Question: when did pete become the head coach
Self-contained rewrite: when did pete carroll become the head coach of the seahawks