Set up a team killing discouragement system, soft ban on repeat behavior. What is currently occurring is that our own team member with C4 will camp at HQ and then plant C4 on the Tanks and helicopters. When the Tank/Helicopter is occupied then the person that is holding the detonator (our own team) blows it up with everybody in it. This is Griefing and it ruins the round and game for everybody because you cant (in its current form) prevent this person from doing this.