Quite possibly the rarest CD insignia to find is that of London's Search & Rescue Dogs Section. It features the silhouette of a dog's head on what is thought to be a pale blue inverted triangle. No examples appear to have survived. There was also a specific beret badge (a dog's head), but no clear photos exist of what it looks like exactly. Photos of the wearers are also scarce.
The below image shows a dog and handler searching for survivors following a V2 explosion in Leytonstone, 3rd November 1944.
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