So, as the title says, this is a question related to campaigns spanning multiple modules in BAT.
If, say, I wanted to combine the two USMC career campaigns, so that it was one 1943-68 campaign, that I'd switch from WAW to JTW when I get to the first JTW mission, would that work, or would there be an issue that I'm not thinking of that'd prevent it from working properly? I tried loading up the first mission of the JTW part in WAW, and it seemed to work just fine (flew it all the way through), so there shouldn't be a error due to the next mission not loading.
Again, the only reason I can see this not working is if there's some hidden record of kills that records the java slot of the aircraft/ground unit in the campaign stats, which would cause a problem as a lot of the WAW planes/ground units are not going to be present in JTW.
If there's a definitive answer, I'd love to know, otherwise I might end up giving it a go, just to see what happens.