1. They must not be removed from the protective covering except for actual use against an attack.
2. When the helmet has been used once it should be replaced by a new one.
Dummy Helmets
Dummy gas helmets will be provided in each organization by which the men may be practiced in putting them on. The men must be thoroughly drilled in the methods to be employed.
The following directions accompany the helmets issued to the British Army. When our helmets are issued it is probable that each will be accompanied by a complete set of rules for its use and full instructions for the method of getting into it and for its care and preservation.
Plate 41e.—Gas helmet.