In the past week I have run into multiple sets of Tac insert boosters in Domination. Here is a couple of videos of these guys showing off their skills.
http://www.youtube.com/watch?v=rOLfG2CO1m0
http://www.youtube.com/watch?v=ZIZNRVHIM4w
I didn't realize people were still doing this. At least in MW2 it was mainly FFA being invades by these guys.