1 minute ago, masterstrider said:Sure is. You can take Guarded Stance twice in a round using two maneuvers and they stack. Why? because they give "melee defense +1", and Sam Stewart wrote that "+" modifiers stack, while "x" modifiers do not. But remember, this only adds to your melee defense. It won't do anything for ranged.
I believe there was a similar question about the Evasive Maneuvers and Stay on Target options for vehicle combat and there were mixed feelings on whether or not you could benefit from it multiple times in a turn. These are both upgrade/downgrade rather than die adders, but it's a similar situation.