For dead/fallen wood, and Prairie areas, Marpat and tan based camo is most effective.
For heavily treed/bushy/mossy areas green based camos such as CADPAT TW, Fleck, OD etc. are most effective.
Just take a look at what kind of field and the surrounding area you'll be playing in.
Also don't worry too much about what's the most effective and just pick something that suits your need, or looks badass.
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