While playing around with that feature, I realised, that you can't shoot your teammates.

I know, they integrated a limitation for aiming (that is nonsense in my point of view: http://feedback.arma3.com/view.php?id=21011), but if you sit on the left or right side in the Assault Boat, you can aim and shoot at the shoulder of the front sitting passenger without any effect.

I hope, the developers decrease the limitation and add the possibility to friendly fire, because you have to pay attention, if you aim and shoot.