A lot of vehs have rear infantry hatches or tank loader positions that they do not use during combat but should be able to man.
When they enter combat they automatically turn in rendering the Air sentry position unable to be used.
on the T-55 they will stand behind the tank and shoot but on the Lav-25 the air sentries will abandon their position once they switch to combat. same goes for tank loader and other turned out but gun manned positions.
Add a way for these AI to remain or be ordered to remain turned out so they can fulfill their role.