I had the same bug. It's a scripting issue (a tank is supposed to roll through and doesn't). Restart the mission and make sure all of the trainer features are off until you fight your way into the parking garage. The game corrects after that.
Had the same issue and that would be the way I fixed it. Now im stuck in constant repeat of getting out of the base in a jeep, that keeps blowing up with all options on or off. =[
Restarted the mission with the trainer off. Managed to finish it. Ironically died less without the trainer. The same is true for Spoiler:
Trainer not running and I still can't advance, My character never uses the tank, looks like I'm screwed.60 bucks down the tube