Danielle,
As Mike says the "codes" are more than likely to be abbreviations. All airfields had abreviation "codes" similar to today when you book a ticket to any destination in the world.
As well as that, the military is full of official and unofficial "codes" for anything from butter to battleships and, if you let us know of some which are stumping you, the ex-service members and non-serving enthusiasts will probably crack those codes for you.
Lang
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