Aside from the camos and paints you can find during the mission, several can be obtained after beating the game.

Unlockable	How to Unlock
AUSCAM Pattern Camo	Beat the game.
Banana Pattern Camo	Beat the game.
Brown Face Paint	Beat the game.
DPM Pattern Camo	Beat the game.
Desert Tiger Pattern Camo	Beat the game.
Flecktarn Pattern Camo	Beat the game.
Green Face Paint	Beat the game.
Grenade Pattern Camo	Beat the game.
Mummy Pattern Camo	Beat the game.
Tuxedo	Beat the game.