I think the there should be 2 different counts for team killing. 3 kill for small arms and 5 kill for when calling in Airstrikes.
I say this because there has been a few matches when I call in airstrikes and i REPEATEDLY (through both mic and text) tell my teammates that they are inbound and get inside/get out of area just overall Lookout, but yet there is always one or two guys who don't listen and get killed. I can't control other people and it will make the commanders position useless if your just going to get kicked for team killing when you did your best for warning them.
There has been 2 matches where I've gotten kicked by this. The second one we had 20~ seconds left on the last objective defense.