Better animations for entering most vehicles should be implemented, especially ones that would need their door to be opened in real life. Some animations seem to be close to finalization such as with the quad, though they could be even more realistic if they didn't have a fade out effect while entering or exiting them.

As a side note I really like where you're heading with the AH-99 Blackfoot's animation, if the window could somehow be opened while going in or out of it and the fade effect eliminated, it'd be so much more immersive.