Each time a model in this unit makes an attack against an enemy unit with the Fast Attack or Flyer Battlefield Roll, re-roll a wound roll of 1 for that attack.
If you selected the Fast Attack or Flyer Battlefield Role for the Xenos Hunters Chapter Tactic (see Codex: Space Marines), each time a model in this unit makes an attack against an enemy unit with that Battlefield Role, you can re-roll the wound roll.