Tanks:
Tanks have crew of 3 people: Driver, Gunner and Commander.
Driver can drive (how unexpected)
Gunner can shoot from 2 main weapons and have less vision.
And Commander have access to machine gun on top and have rangefinder for main cannon.
IFVs:
Same as tanks but without commander.
CoPilot in helicopter:
If main pilot is dead can take control (but can just change seats lol).
Blackhawk: have access to camera with thermals or minigun on bottom of the chopper
Littlebird: can shoot from secondary weapon, throw grenades and use some gadgets like binocularus. Edit: Tanks and APCs should have x5 (or more) health points than now and have fixed physics like tanks not supposed to do wheelie every time they got hit by another tank or RPG (just make heavier and less recieve knockback from explosion). This post supposed to make tanks be tanks, like drive in the main street and have the crowd of friendly infantry following.