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Hello, Like the other TA users said, you only need 200 kills.

I found it easier playing batttle commander, so if your trying to level weak weapons, killstreaks boost your damage. Which i believe is the 1st perk.

During your 200 kills, i recommend trying to get to 10 killstreak per gun, has it counts towards Expert of war!

For the killstreaks, camp a good choke point, i usually find alleys on cul-de-sac or any other tight map, keep your wits, every 2 kills your ammo replenshes as do your grandes. So pray, spray and reach another 200 gun kills in no time.

Its worth it for the Dragon camos.

Wasn't sure where put this, thought it be best put here for the earlier players to start, well early.

ok so it takes 200hundred kills with a weapon and like necromancer2k8 says team death match is the easiest to get kills on. depending on your style of play go into the armory, and pick any class, scroll through the availible weapons for the one your best with that youve unlocked but i'd honestly just use the M4 its a decent all rounder, and select the ability perks you want for kills only i would suggest any combination of the following
tactical relode 1point
quick draw 1 point
straight from the hip 3points
steady aim 2points
you do have to unlock these with rank and you only have 4points to start off with but you gain an extra one when you hit rank 25 if your already at rk50 defo use the XM10 assault rifle for this.
you will also unlock diffrent scopes, silencers, under barrel shotgun, airburst and EMP launcher as you rack up the kills

note - if you buy second hand or just dont have the battle code, you can still get this, just use one of the starting weapons, the m4 would be my choice, thanks for pointing that out