Tracer darts are a lot faster in Bad Company 2 post-patch so if you’re flying a helicopter make sure you have smoke to disable any tracer. Seems to be some concern that smoke in the PC version doesn’t work unfortunately. There’s also flares. This tutorial suggests,
The Blackhawk has anti missile flares that can be deployed by using RB if you have V ALT WEP equiped. This greatly increases its survivability because it makes it nearly impossible to hit with missiles if you spam your flares.
Geoff demonstrates removing tracers from a heli with smoke.

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Alex M. (22 comments.) on April 22, 2010 at 11:43 am.
Hmm, gonna be hard to pick between smoke and the machine gun for the tank now.
David Nicol (210 comments.) on April 22, 2010 at 4:12 pm.
Stick with the machine gun on the tank. Smoke’s really only any use on the helicopters. Tanks are easy targets for engineers as they are quite slow to move so your only real defense is to hose them down with the .50.
Donncha (675 comments.) on April 22, 2010 at 11:54 am.
Even if the tracer dart hadn’t got a speed upgrade we probably would see a lot more people using it. Just like in MW2 where air support doesn’t last anywhere near as long as it used to. Someone’s always got an air class equipped!
Have you tried it yet on helicopters?
David Nicol (210 comments.) on April 22, 2010 at 4:14 pm.
I’ve used smoke in the helicopter. I wasn’t traced, I just pressed the wrong button. It makes a cool noise though. It’s important to remember that even when running smoke a decent shot will still shoot you down.
Donncha (675 comments.) on April 22, 2010 at 4:19 pm.
But I only know one person who’s a decent shot against helicopters. Hopefully I’ll be playing on the same team as him
David Nicol (210 comments.) on April 22, 2010 at 4:27 pm.
There is…… another. I forget his name though. I was gunner on Geoff’s Blackhawk (shortly after the tip video went up) on Isla Inocentes and we got tracered. Geoff deployed the smoke, we made another orbit and got shot down. The same guy was a beast with the Carl G all through the game.
drunkindunkin on April 22, 2010 at 2:53 pm.
Ah I didn’t even know that smoke disabled tracers. I just tried my best to dodge anything that was thrown at me after being traced.
Donncha (675 comments.) on April 23, 2010 at 1:09 pm.
Looks like vehicle smoke in helicopters could indeed be broken on the PC. Is he pressing the right key combo (both mouse buttons) to activate it?