I need help in identifying a badge painted on an original British Mark II shell. The shell was used during the siege of Malta as it still has patches showing the original rubble-wall camouflage paint scheme. The badge consists of a white triangle painted on the side of the helmet. The letters AA are stencilled in blue. Attached please find some photos of my helmet. More photos can be seen on this link:
Does anyone have any idea what this insignia stands for? I though maybe it had to do with a HAA or LAA regiment but the insignia there is blue and red.
Thanks for your help.