Conan, I do have the time on the ground, only spent around 1/5th of my total time in a plane, less then 60 hours out of 280. My highest scoring round was as a ground pounder as well, so I can do a bit more then drop bombs

And I've got another two or three days of non-ranked time to add to my total, all of it ground pounding..clan practices on 16 player sized maps.
Most of MY TKs actually come from my ground pounding. People running over mines, running up to something I've c4'd, standing next to armor I'm putting AT into, or other stupid moves. I stopped playing sniper because EVERY claymore I put out resulted in a TK, no matter what. I rarely play engineer because every mine I toss out attracts a loaded friendly APC or jeep, even in clan practices!