A tweet by Battlefield Bad Company 2 lead designer David Goldfarb that's retweeted by the BFBC2 feed says that even if you stand on your head, they are not adding the ability to go prone in the military shooter sequel: "Fyi we will not add prone based on anything. You can stop asking now. :)"
The first thing I do if I'm playing defense is hop in a mounted gun and knock down all the trees and fences where the advancing army can hide as long as they don't benefit my team.
Same here....makes for a hell of a time for the infantry.
And on attack - I am the ass that loads up 6 c4 and drives a 4wheeler into your shit!