The Sniper That Isn't
Primary- G3 w/RDS, M14 w/Silencer, or MP44
Secondary- Anything, but a SMG or shotgun is best(w/ Overkill)
Special Grenade- Stun
Perk 1- Claymore x2
Perk 2- Overkill or Stopping Power
Perk 3- Deep Impact or Last Stand
Highest Level Needed- 52(MP44)
Info- I created the class a few levels after getting the G3. I essentially used the G3 as an M21, but put on a RDS instead of a scope.

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Sniper
Primary- Any Sniper, but I use the M21
Secondary- Any
Special Grenade- Smoke or Stun
Perk 1- Claymore x2
Perk 2- UAV Jammer
Perk 3- Deep Impact
Highest level needed- 49(Barret .50 Caliber)
Use-

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Invasion
Primary- Any AR except G3 and M14
Secondary- Desert Eagle
Special Grenade- Any
Perk 1- Frag x3 or Bomb Squad
Perk 2- Juggernaut
Perk 3- Anything
Highest Level Needed-52(If MP-44)
Use- Anything except sniping, unless you are good with the ACOG sight. And I mean with 10 shots making 10 bulls-eyes good.

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Ghost
Primary- G36c/M4A1 w/silencer, Digital camo(NECESSARY!)
Secondary-M1911 .45 w/silencer
Special Grenade-Stun
Perk 1- Special x3
Perk 2- UAV Jammer
Perk 3- Dead(ly) Silence
Highest Level Needed-45(Perk 3)
Use-Run 'n' Gun!

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Assassin
Primary- Any Sniper Rifle
Secondary- Any SMG or the M60E4
Special-Any
Perk 1- Preferably Claymore x2 if you will snipe more, otherwise Bomb Squad.
Perk 2- Overkill
Perk 3- Your choice, except for Iron Lungs. It is actually pointless.
Highest level needed-49(If you choose the Barret)

Close Encounters
Primary- RPD w/Grip
Secondary- Desert Eagle
Special Grenade- Smoke
Perk 1- None
Perk 2- Double Tap/Sleight of Hand
Perk 3- Deep Impact
Highest level needed- 43 (Desert Eagle, 55 for Gold)
Use- Supressing fire, Blitzkrieging, helicopter killing