My teammates are immortal.... no matter how many bullets they get hit by... ;((
Do you know how obviously jarring that is in a military shooter - going for realism....?
I really think they should be able to be killed or wounded - which would then mean being taken out of th fight.
You would be required to collect them at a hub/base location on the map- to deactivate them and they rejoin your squad.
Maybe have even a cool down timer like 24hrs for them to heal before they can rejoin the squad!