If you mean forest with lots of mossy trees/small shrubbery then CADPAT will serve you well as does Flecktarn and Woodland, really any green based camo will fit. However if you mean a forest with a lot of dead fall and brown trunks then something more brown based with a bit of green is best. For this I suggest something like MARPAT or Multicam (this one works OK in a green environment as well), another option might be some tan based camo with a more dominant brown/earthy tone like 3 colour desert but maybe a bit more brown. Also straight coyote brown is a good choice as well, similar to Olive Drab it also works well in a "Contractor" loadout too.
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