Anti Air Assets
I will often play as a counter to AIR Assets as Infantry, some smaller maps (New Sobek City/Eastwood/Manhattan Bridge) the heli can dominate as it has sufficient buildings or low lying areas for cover which makes it hard for the long timer on the Stinger to get a lock & fire, all other maps not so much of a problem, a good pilot will know the cover & low routes to take.
Speaking of low routes, I think the stinger should still lock on at lower altitudes. I was doing research of the stinger yesterday & I've played a lot of Arma 3 where I am constantly using a FIM-92 Stinger, this game has the stinger very subdued indeed in comparison.
I play Anti Air a lot when they are dominating the field & have my own complaints about this subject which I have not voiced yet.
You can do a lot of damage to a helo in short time with a LMG,or Assault rifle especially if you have voice comms or use squad/team chat and suggest you squad concentrate sustained fire on it, to at least make the pilot take evasive action, which could very well save the game for you. I often while sniping, start targeting the helo, cos they have no idea where it's coming from and you can actually snipe the pilot & gunner through the windscreen, I have done this several times, if you are using a .50 cal you can do some damage to the helo to force the pilot again to take evasive action. I really like sniping them. 😉
One point of interest is the (IRCCM) which is a counter for counter-measures for flares, NOT INCLUDED BY EA !!!
I feel that the HELO'S & JETS do not have enough counters in BF anymore, there's no ground mounted IGLA (BF2) or Stinger launchers, just AA guns for any soldier to use, I hardly see anyone running a kit that has a stinger in it, probably because there are so many ground vehicles, they expect the air vehicles to be taken out by those who drive them or other air vehicles, but when it's manly infantry on the ground, then that is when the helo will dominate, players need to start paying attention to the ticket count and how the helo is affecting that.