When I equip the full set of AID Centauri armor after purchasing from the doctor in the evacuation camp my attacks do no damage. It is the full set bonus that is responsible as I began combat with the full set equipped and then removed the helmet. After removing the helmet my attacks did full damage. I tested this with every other piece of the armor and it is only when all of them are equipped that the attacks do no damage. I believe this bug to be related to the full set bonus which says "When striking an enemy with a melee attack damage in increased for a short time. Subsequent attacks can stack this effect multiple times"
AID Centauri Full Set Bonus Bug