You need to get to rank 50.
The only way to unlock the Javelin is by playing the Multiplayer on Modern Warfare 2, just like to do with every other gun. It is unlocked at level 50, and when you prestige, you will have to reach level 50 again to unlock it, like the other guns.
You don't.
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
ak47
You don't.
The RPG 7,or the Javelin
You unlock it at level 36.
You cant.
No.
you have to reach level 50
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
Sorry there is no alien invasion
Level 38