From verso of card: "The illustration shows members of a DecontaminationSquad in oilskin suits; a hood is also worn, but this is not shown in the picture. This equipment will give complete protection against the liquid or vapour of mustard or other persistent gases. It is essential to have squads of men trained to work in this equipment so that they can deal with and effectively neutralize any contamination which may have taken place. Owing to the fact that no air can get into the suits, men cannot work in them for very long periods of time. These suits are decontaminated by boiling."