One of the lesser seen helmet markings is that related to decontamination of food stores following a chemical attack. An immense amount of preparation went into dealing with expected chemical/poison weapon attacks. Decontamination Squads were to deal directly with the chemical weapons but aside from them specialists were trained to provide direct support in managing food stocks that may have been affected. Another part of the system was the Food Analyst who had the rather unfortunate helmet marking of "FOOD ANAL". I don't have much information about the photo and cannot ascertain for sure it is an original wartime photograph.
News about interesting insignia, ARP related info and period photos that turn up.