Does attacking the Airship/Train/Boat count as they’re Behemoths rather than vehicles? I guess not as I inflicted a lot of damage to the Train with the AT rocket gun / AT grenades but didn’t count as any thing towards the medal.
I destroyed a landship with dynamite, got 5/75 damage progress. I shot at a low flying plane with K-bullets a few times, and got the missing 70. I played assault for several rounds destroying vehiles, but zero progress towards disabled and destroyed vehicles. No way to check progress either, so I had no idea I was not making progress. The medal progress tracking is infuriatingly terrible.