Hello, Kaptain.
I don´t know exactly what is the problem, but maybe the mission is made that way, I mean, for doing it more exciting or something like that.
Or maybe is just a failure in the design of the mission or a game bug...
What mission are you talking about and what platform you drive?
I have not finished the campaign yet because I don´t like it so much, but not for what you say, but for the concept.
Some mission are much easier to play with one plataform than another (and the difference sometimes is brutal), and I would preffer to begin the campaign with one platform and/or side and not being forced to change side only because I´m not prepared to fly a P-3, or a Perry...
I know that is precisely the idea of the creators, that you play all platforms, but I don´t like that point. Is jus a personal thought and I still like the game VERY MUCH!