Rules (7) Unstoppable Advance All Rhinos, Razorbacks and Land Raiders in a primary detachment commanded by Tarnus Vale gain an Invulnerable save of 5+ against glancing hits. Master Gunner Any friendly vehicle with the sub-type (Tank) chosen from Codex: Space Marines or the Space Marine Siege Assault Vanguard army list in which Captain Vale is being transported gains the benefit of his Ballistic Skill and the Tank Hunters special rule. Chapter Tactics When choosing an army, all models in the same Detachment or Formation must be drawn from the same Chapter. If a unit's datasheet contains a Chapter in brackets after the Chapter Tactics special rule - for example, "Chapter Tactics (Ultramarines)" - the unit must always be drawn from this Chapter, and therefore cannot be included in a Detachment or Formation with any units that are drawn from other Chapters. All models drawn from a given Chapter benefit from that Chapter's Special Rule. If a unit contains models drawn from two different Chapters, it counts as from neither Chapter, and thus benefits from neither Chapter Tactic. Tank Hunters A unit that contains at least one model with this special rule re-rolls failed armour penetration rolls against vehicles (both with shooting and in close combat) and can choose to re-roll glancing hits, in an attempt to instead get a penetrating hit - but the second result must be kept. Stubborn When a unit that contains at least one model with this special rule takes Morale checks or Pinning tests, they ignore any negative Leadership modifiers. If a unit is both Fearless and Stubborn, it uses the rules for Fearless instead. And They Shall Know No Fear A unit that contains at least one model with this special rule automatically passes Fear and Regroup tests. When it Regroups, the unit does not make the 3" Regroup move, but can instead move, shoot (or Run) and declare charges normally in that turn. Furthermore, if a unit containing one or more models with this special rule is caught by a Sweeping Advance, they are not destroyed, but remain locked in combat instead. Independent Character Independent characters can join other units. They cannot, however, join units that contain vehicles or Monstrous Creatures. They can join other Independent Characters, though, to form a powerful multi-character unit! Independent Characters pass Look Out, Sir rolls on a 2+. A unit that contains one or more Independent Characters does not need a double 1 to Regroup if reduced to below 25% of its starting numbres, but instead tests as if it had at least 25% remaining.
Full details in BRB. Rule too long to copy verbatim. 