Each time a model in this unit makes an attack against an enemy unit with the Heavy Support, Lord of War or Dedicated Transport Battlefield Roll, re-roll a wound roll of 1 for that attack.
If you selected the Heavy Support, Lord of War or Dedicated Transport 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.