When player in the tank, or other vehicles, in the actions menu there is no a status of "Damaged".
In the action menu, in the status section (5-button) exist only:
1. Call support
2. Fuel low
3. Ammo low
5. Where are you?
6. I am under fire
7. One less
At least it seems strange. Thus a player can not call a repair specialist from his own squad and can not report about self damages. Yes, in the action menu, there is "call Support" status, but in most cases it can be a useless item, because in a mission does not exist, allied units with support-waypoints and if at the same time, the player's squad there are engineers and repair specialists or even repair vehicles! The player is not able to call them.
In the given case engineers and repair specialists/vehicles in this squad can't deal with their core responsibilities.
As seems to me, damaged-status should work the same as in the wounded player and medics.
The player in the damaged vehicle report about the damaged status and then, the commander of this squad, should order the repair specialist or engineer (if they exist in the this squad), to repair the damaged unit.
BIS, try make Arma3 better!