objects & units need to be revealed for a comprehensive situational awareness and a better sim.
When player is alone (not belonging to a group), it seems there is no reveal possibility when targeting an enemy. You can reveal all friendly or empty vehicle you want but enemy has to be killed for that!... or enemy must fires at you.
Add just a rookie in your group and enemies can be easily revealed!
Please change reveal logic (engine and "reveal" function for scripting).