I want to play as Red Dragon but from what I can gather they're not very good. Does someone have some suggestions for deck building as Red Dragon?
Well, Red Dragons have some pretty strong infantry options.
They've got FAGOT ATGMs, IGLA AAs, napalm rocket launchers, competent infantry carriers, etc. The infantry are all also fairly cheap and cost effective. One particularly noteworthy infantry they have is the Tanke Shashou (basically translates to Tank Killers). At a glance they may look pretty stupid with their low damage HEAT rockets but I've never been disappointed by their performance in the field. For some reason they're really, really effective.
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For tanks, you've got two options.
You can either go North Korean with the tried and true T-72s or the T-90 ultra tank (I don't think even the Soviets get this). Or you can go for the Chinese tanks which are all fairly fragile but super accurate. I'm more of a fan of the Chinese ones myself. I really like the ZTZ IIs and the ZTZ IIIs. There was once I singlehandedly won an entire 10v10 match with a handful of ZTZ IIIs obliterating the enemy's rear. I think they killed things so fast most people didn't realize what was going on. I really like tanks that don't miss but you can go with what works for you.
I don't recommend bringing the really garbage stuff. On paper it sounds fun to spam a hundred shitty tanks at the enemy, but I've never seen it work. A single Leopard 2 can kill dozens of Ch'onma-Hos. You'd just be donating points to them.
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For recon it's pretty standard stuff.
I mean, other than the women sniper team for the North Koreans. Oh, and they have a recon truck with a grenade launcher if you find that you really want to snipe infantry or something. There's no high tech stuff like the Longbow or the Akula here.
Though the Chinese do field what I like to refer to as a sniper tank. The ZTQ-62G is actually really useful in sniping high value targets like enemy recon. It's basically a ZTZ-II with better optics and less armour.
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Vehicles are also fairly standard stuff.
Again the Chinese do bring their pretty good tank-hunters in the PTZ line. They're alright. More of the usual Chinese philosophy of super accurate but fragile.
They also have the WZ-550. It's umm... a Longbow helicopter on wheels.
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Helicopters are again more standard stuff. Nothing amazing here.
North Koreans get older variants of the Soviet arsenal. Good workhorses these. Also a grenade launcher helicopter, which is always useful for clearing out infantry.
Chinese get specialized helicopters. So dedicated anti-air or anti-tank helos. They don't have any gunships other than the terribad Z-5A, so you'll have to rely on the North Koreans for that.
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Planes are all kinda... meh. They're cheap though, mostly.
Just bring what you'll think you'll need but don't go in expecting to win the air game with this. The MIG-29 is a fantastic and affordable workhorse though, so maybe get that at least. The J-7 line is also cheap and fast for bombers.
A lot of their planes have fairly meh accuracy though, so keep that in mind (read: get them as veterans).
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In conclusion, if you're getting this, you'll be focusing on spamming tanks and infantry as that's your strengths. They field cheap and affordable units so just pump them out. They do have a handful of really potent expensive stuff but really it's going to be the cheap stuff that's your core.