I play 99% of the time infantry and it is not easy to get an lock on to an helicopter when I play the objective
Every little thing like a tree or small beam are interrupting the lock on even if you can see 95% of the helicopter
If there are 2 helicopters, they clean nearly every Flag in the open in 90% of the time (depending of the skill of the pilot)
you need at least 3 Missiles in a short time to get down a nightbird so you need 3 player > one who will trigger the flair (so no points for him also it will cause an cooldown on the lockdown for all AA in this area) and then 2 rocket to kill (sometimes 3) but if buildings are close it is 10/90 that you get a hit..... and I think in only 10% of the time a good nightbird gets down
Also, the range for a lock of a mobile AA is small related to the range the helicopter can to damage.
The only thing is to try it every time and a lucky hit or maybe a chopper down....^^
@Necromantioni was going for the kill, one hit is only a short break from around 30-40 sec at max
there are more threads against a infantry than against a chopper
