First it depends on if you just want to wear any camo, or if you're trying to achieve a particular overall impression (US Army, Canadian Army, British, etc)
Another factor to consider is if "sides" in games get broken up by particular patterns/styles: then you may want to pick something that will put you on the same side as your friends (or whomever you wish to play with... maybe you like shooting AT your "friends" </evil>)
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