You need to have an icon for it to work so dont think it will with enemy Gvs, at least if your in a vehicle. Plane to vehicle should work AOK.
Workaround, turn ProtectObjects off , turn Killshooter off, and then switch to the same side as the offline planes/vehicles are.
LCG is the training sight we have available in the TA or offline if enabled for guns in the game. Plane guns, bomber guns, field guns, even 5" ship guns.