For military freqs you'll need a scanner that can receive those. Basically, just try to punch in the freq and if your scanner doesn't take it you're out of luck, sorry.
Generally the air boss freq is going to be silent until the day of the show. So don't expect to hear anything on it until then. It's of course possible that they're using different freqs than the ones you found. But hey, that's what scanners are for! Make liberal use of the lock out feature as you search for the freqs you're looking for. It's never taken me more than 10 minutes - usually less - to find the air boss. Keep in mind that the air boss freq will be more active during the civilian performances and might be virtually silent during the military performances.
Good luck!