Any Call of Duty 2 online playing tactics?

Question

I find it very difficult to stay alive or more than a minute

Answer 1

What'd they teach you in Basic training soldier???
The best way to stay alive is to make good use of your crouch and prone keys. Make sure you use cover and especially when reloading stay low and out of the line of fire, then reload if you have the cover available.
Once you fend off a wave of attackers...you can stay put. The battle still goes on but if you stay put you're squad won't be engaged until you advance. naturally I'm sure you know that your aggressiveness controls the movements of your squad.

So stay low in firefights and use cover when loading if possible. Also...make good use of smoke to get across intersections to go from building to building and don't be afraid to use grenades. A word to the wise...in the Russian campaigh where you're repairing the communication wire...use your smoke sparingly. You'll be working at disabling some tanks that are deadly as hell. Use smoke and you have to run up on them. Keep manauvering around them because they can chop you into hamburg with that machinegun. plus...those 88mm shells they shoot have a tendency to knock you down...blur your vsision and make your ears ring.