▁terrain . ▁ ▁In ▁some ▁cases ▁they ▁may ▁be ▁fitted ▁with ▁special ▁fire f ight ing ▁units ▁called ▁Br end on ▁p umps ▁to ▁support ▁he ath ▁and ▁mo or land ▁fires . ▁At ▁some ▁rural ▁stations ▁they ▁double ▁up ▁as ▁emer gency ▁response ▁units ▁for ▁co - res ponder ▁roles . ▁ ▁Emer gency ▁response ▁unit ▁co - res ponder ▁vehicle ) ▁Co - res ponder ▁stations ▁have ▁a ▁dedicated ▁vehicle ▁for ▁' co - res ponder ' ▁medical ▁calls ▁so ▁the ▁fire ▁app liance ▁remains ▁available . ▁The ▁vehicles ▁are ▁equ ipped ▁with ▁o xygen ▁and ▁autom ated ▁external ▁def ibr ill ator ▁( A ED ) ▁equipment . ▁ ▁Inc ident ▁response ▁unit ▁ ▁The ▁Service ▁oper ates ▁three ▁incident ▁response ▁units ▁( IR Us ). ▁They ▁are ▁position ed ▁at ▁Well ington , ▁O ke ham pton ▁fire ▁station ▁and ▁B ove y ▁Trace y ▁fire ▁station . ▁Note , ▁the ▁IR U ▁based ▁at ▁Well ington ▁is ▁not ▁hous ed ▁at ▁the ▁fire ▁station , ▁but ▁at ▁Ch el ston ▁Business ▁Park ▁near ▁Well ington . ▁ ▁They ▁are ▁supplied ▁by ▁the ▁Department ▁for ▁Commun ities ▁and ▁Local ▁Government , ▁to ▁respond ▁to ▁inc idents ▁involving ▁mass ▁de cont am ination , ▁defined ▁as ▁inc idents ▁where ▁more ▁than ▁one ▁person ▁can ▁be ▁de cont amin ated ▁simultaneously ▁using ▁the ▁same ▁equipment . ▁ ▁Each ▁IR U ▁is ▁maintained ▁by ▁a ▁host ▁station ▁with ▁assistance ▁from ▁support ▁stations ▁which ▁all ▁receive ▁training ▁on ▁the ▁equipment ▁at ▁regular ▁periods