Basic strats/tips

-Cover, cover, cover! Don't run across the bridge in the open; you're sniper bait. Even going prone on a low-lying area like that is really just making you a slow-moving target. If the area's clear, run in the open, but once you start taking hits, plan your moves from cover to cover.
-Always work in teams. At the very least, use the buddy system if you all can't be in the same area for whatever reason.
-Squad up immediately. You'd be amazed how much it helps with coordination. Plus, any competent commander can just select our whole squad instead of individual soldiers.
-Look at your squad's kit; if we've got all support, maybe one should go engy or assault.
-Feeling a little slow? Don't care about dying? Jack up your speed by dropping your heavy body armor. In your kit, customize and uncheck the box. You'll move faster but you'll also take more damage when you get hurt. Great for snipers.
-If you're planning on getting in that fancy tank there, invite someone with you! Your chances of survival go up immensely when you've got your gunner slots filled, no matter which vehicle you're driving.