I think the better question is, are you going to annouce which country you are hitting? Historically speaking, it wasn't much of a stretch for the Germans to know that the B26s and escorts were attacking them
And I kinda doubt the Japanese were worried about a 9th AF raid
It would at least allow folks to try and provide some opposition if they so choose. I'd think that for the history aspect you'd prefer to see folks in 109s and 190s defending then a bunch of N1Ks or LA7s.
But either way, more power to ya for trying to bring a little history in to the game