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How to get diamond camo in black ops 2 
Unlock all the weapons on a particular class. 
Play through the game and make sure that all weapons in a specific class have been unlocked and are available to use. 
Weapons can be unlocked only when your character reaches a certain level (such as the r870 mcs, which can be used when your character reaches level 4).
Choices:
 + Ammunition is also used if your character reaches the maximum level (such as the r880 gm and core generation). However, attack skills can only be unlocked when you reach level 4 so combat skills are scarce.
 + Complete missions and battle out on multiplayer matches to keep gaining experience points (xp) to raise your character's level a lot quicker. Unlock gold camouflage for every weapon in a particular class.
 + Level up the m16, r870 mid hp (3 prize weapons) and ncaa sniper rifle. The ak-47 and r79s are the weapons most commonly acquired in the game.
 + There are varying levels of combat-ionize armour is one of the most effective things you can do. Using a sniper rifle will make you run at a good speed and move quickly, making your class pretty ideal for fighting.
Complete missions and battle out on multiplayer matches to keep gaining experience points (xp) to raise your character's level a lot quicker. Unlock gold camouflage for every weapon in a particular class.