As you may know, I am a definite Battlefield 3 geek. In the less than ideal amount of time that I have to play video games these days, I try to at least get a few rounds in when I can. I've only had a chance to play the latest expansion, Armored Kill, once and it blew me away, meaning I kept getting slaughtered by the AC-130 gunships. I can't wait to learn that beast.
Whenever I'm trying to get an upper hand I do research by watching videos from PWNSTAR of the Machinima Network. His latest is this great breakdown of how to defend properly in Armored Kill's Rush Mode.