It's not as unusual as it might seem. In wartime once manpower was turned from the "raw material" of the new recruit into something like a soldier it was farmed out to where it was needed and their are many such examples. It was very common in WWI and in WWII my father-in-law who was from Canterbury in Kent (about as far South as you can get before getting wet for non-Brits reading this) served in The Royal Scots Greys!
I think you are probably right about the BD thing though. I'll still keep an eye out though!
Regards
Mark
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