Invader ATV Squad

If this unit has the Grim Resolve Chapter Tactic, or it has the Inheritors of the Primarch Successor Tactic, and it is using the Chapter Tactic of the Dark Angels, then:
• Models in this unit have a 5+ invulnerable save against ranged attacks. In your Movement phase, if this unit Remains Stationary, it loses this invulnerable save until the start of your next Movement phase.
• Each time this unit Advances, until the start of your next turn, models in this unit have a 4+ invulnerable save against ranged attacks.