When you reach level 38 you wil unlock the Overkill perk. You can use thi perk as your second perk and it allows you to use two primary weapons
1. Spell Modern Warfare right. 2. Its not a level you have 2 unlock it with kills =]
The fourth level in Call of Duty Modern Warfare is No Russian (which can be skipped.)
Level 42
You cant, you can wield two at once if you have unlocked the akimbo attachment though.
The game to be released November 8, 2011 is called Modern Warfare 3 it was just that they are only released every other year. Some information on the game, maps level. weapons etc can be found in the related link
nothing
The Lieutenant Rank is at Level 34
Level 38
You unlock it at level 36.
You need to level and complete challenges
If you're talking about the museum level from Modern Warfare 2, then probably not. That was a one time thing.
you have to be level 29
Like in Call of Duty Modern Warfare 1 it is called 'End game'.