you have to reach level 50
You cant anymore its been patched
You unlock it at level 36.
You cant.
No.
Get to Prestige 9.
you can unlock it with you're first killstreak award unlock
You unlock it by getting to 10th Prestige.
you cannot unlock them you have to buy them on PSN or LIVE Marketplace
Get to rank 70
Sorry there is no alien invasion
ak47
Level 38