Yes, you need to allocate VALT in your third upgrade slot, vehicle upgrade slot. Try out the other combinations of upgrades as well, VALT is pretty nice I don't know which helo specially, perhaps the HIND when your the gunner your secondary fire is a tracer dart helpful to the pilot as if he has a hellfire missile loaded and knows how to lock on, some tanks secondary fire is machine gun. VSMOKE iis helpful if you get tracer darted just hit your flares/smokes. VWARHEAD is my favorite it deals a greater amount of damage with vehicle fire especially for tanks if the M-COM is inside a house and also with UAVs missile it can help tanks down tanks with easy, usually 2-shots will do it, sometimes even one shot if you hit the right spot or it if it already damaged.
Just check out the "Master Tactics" thread stickied on the top of our Bad Company Division forum section, I found a many things helpful, like you only need 2 mines to tank down enemy armor/tanks. Also, I need chopper flying practice as well I generally do it when I am by myself and just jack a helo to get some practice not like the rest of the recon's and non-objective players in my team care XD, search Bad Company 2 Helicopter Flying Tutorial by Wunkus on youtube I found it very helpful but it still comes down to a matter of practice.
I would be down to help you get down so general know how done tonight I should be on after tomorrow no more late night sessions till the AM for me I return to college and need to saddle up for a tough semester.