Headquarters. Kill Confirmed does not get you that much XP. If you pick up every dog tag, you'll get about as much XP as playing TDM.
HQ, Dom, Kill Confirmed, TDM = Watch your levels go up FAST!!!
That is what I was thinking too.
Kill Confirmed with the Specialist Strike Package. If your aggressive, you can earn a shit load of EXP quickly. I got to 5th Prestige by doing on this combo.
The Class in this video, is like the perfect rank up fast class. At least for me.