It seems like the AI won't reverse a IFV-6C properly at times, it just wiggles the vehicle while reversing at a very slow pace. I'm unable to reproduce this at all times, but I'd say out of 8/10 times I'll manage to make it reverse like this. It might take a one of two attempts; reversing, forward, and then revering again.
Beta version used: 0.75.10824 (existed since vehicle was added)
It seems this also affects the BTR. I'm changing the title to include a more general 'tracked vehicles'.