by AdrianB38 » Sun Oct 08, 2017 10:27 am
Well, LAA is Light Anti-Aircraft - though that might be obvious.
The compound number is trickier. All this is very much off the top of my head from memory but I've tried on a couple of occasions to disentangle unit identities like this and it's not easy. There are sites with Orders of Battle for the RA in WW2 but they don't seem comprehensive. A compound number like that might be a Regiment within the RA followed by the Battery number - the RA moved from Brigades to Regiments at some time in the interwar period.
On the other hand, another use of compound numbers was for AA batteries manned by both Regulars and Home Guard - one number was effectively that for the Regulars, the other for the Home Guard. Together they make up the designation of the whole battery. I don't think that's what this looks like but when abbreviations are used, anything can happen.
My first guess would be 51 Regiment with 38 Battery in it but that could be complete nonsense on my part. It's just an idea to explore in case no-one has a better one. Suggest that you try various combinations like that in Google.
Good luck. If anyone can put me out of my misery at guessing, I'd be grateful.
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Adrian