I was contacted by a visitor to the site regarding a helmet with the letter "E.O." on it. It's probably for an Evacuation or Equipment Officer but to see a white helmet with two black stripes for this position is quite peculiar. The myriad different markings found on home front helmets means new variations crop up weekly. If you have any other ideas what the letters could mean please let me know.
News about interesting insignia, ARP related info and period photos that turn up.