OK...
Now that the UAV + C4 tactic has been approved let's develop the best practice for the tactic.
1) 12 C4 charges is better than 6, causing the MCom to go down in a single attack.
2) The UAV driver does not know when the blast takes place, so the C4 detonator needs to provide feedback when they get confirmation of the detonation, so the UAV driver can pull the UAV out.
3) The detonator can not be too far away. For instance on Port of Valdez, the detonator can not remain at the UAV terminal at the top of base 1 spawn as it is too far and the detonation will not trigger. He must advance up near ReCon/Sniper rock to be close enough to trigger the detonation. Keep this in mind for other locations on the map.
4) The UAV driver should provide verbal feedback as he is approaching the objective, such as a 3, 2, 1, fire count down.