you need to get a certain amount of "1 Shot one Kill" medals with a sniper rifle.
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Some of the suits are only unlocked by playing multiplayer
Companies like Activision release sales figures for the game, but even some of the Infinity Ward employees have quit and filed suit over the answer to that question and the profit sharing they were to receive
You cannot put on camo, but if you equip a gun from the Sniper Rifle section your character will be wearing a Ghillie suit, which provides better camouflage than standard clothes/outfits do on almost every map. but if you get a certain amount of headshots you get camo for guns!
Either: a little out of breath or short of breath.
You have to buy some off of playstation store and Xbox Live, like the tank suit, obsidian suit, elite suit, etc. You get the military suit by completing the game on any difficulty or on hard. the main suit you upgrade:)