When there was a squadron of A-10's at Willow Grove years ago, they regularly used 51.5 which was a common freq us hams used here in SE PA.
interestingly enough, 51.5 is one of the three 50mhz freqs i have logged locally, apparently there are some freqs that seem to either naturally or perhaps by design that always seem to pop up more than one would expect if chosen at random.
there are the rules of thumb you read about when first getting into mil-air like number strings (234.500, 345.600) repeats (252.525) the shooting related (300.6, or my favorite winchester 303.0 which seems like a weird association, but i suppose logical at the time. had i named it, i would have called it Marlin, but whadda i know) and the most frequently demonstrated rule of thumb i have encountered which is whatever they feel like doing whenever they want to. we don't need no stinking badges!
so the only other 50mhz i have logged actually seems like the one, going by the first rules of thumb you would encounter more often, yet i have only had one instance noting it in use:
55.5 FM
and considering it is in a virtually unused white space these days, it would seem far more logical to use 55.5, whereas 50.125 and 51.5 run the risk of stepping on various toes, be more likely to be overheard, and less conducive to unfettered use of fowl language, smack-talk, blatant violation of various policies or planning discussions prior to violating said policies and any other types of fun one might have while getting paid to hottrod around in a multi million dollar aircraft. I know I would.
i guess thats why i am a civilian.
