From January 1942, following a considerable amount of requests from local authorities, the Ministry of Home Security signed off on several badges for newly-qualified instructors. Three of these badges were the ARPS, LARP and LAGC - photos of these badges are on this page. Also mentioned is a CAGS for Civilian Anti-Gas School, though I have never seen a badge with these letters on it. A cloth version of badges was also looked into and samples created. However they were never issued.
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