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 - "ammo Low" or "Fuel low". 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.
Also in the action menu, there is "call Support" status, but it can be a useless item, if 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.
As seems to me, damaged-status should work the same as in the wounded player. The player report about the damages 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!