In my dept in Connecticut, we tried doing the color coded helmets and it just became too much of a pain because a junior member recieved a yellow helmet, then a blue one once they turned 18 (blue indicates your an exterior ff) then when you passed firefighter 1 you recieved a black helmet and chiefs have white. we found it cost too much money to keep buying different helmets so now every member recieves a black helmet and we color coded the helmet shields instead. a junior firefighter has a yellow shield, non-interior/probationary firefighters have orange, interior firefighters have black shields, and officers have white shields. we found this to be more cost effective by spending $30 on a shield instead of $200 on new helmets. we also have a rule that junior and non-interior firefighters do not respond to any mutual aid call. our feeling on this is that if someone is requesting our help, they need interior firefighters and the dept recieving our aid knows how many firefighters they have coming.