theres fire proof material and sprays that can be used in turbans no problem im sure.
but for riot cops/armed police/soldiers etc you NEED the protection offered by a kevlar helmet.
Its a health and safety matter.
it is pretty messed up that sikhs have been in the police now for decades and this is only "suddenly" becoming a problem!! Why the hell havent the "sikh policemans association" or whatever they are called dealt with this issue a long time ago???