Techmarine

If a Space Marine vehicle has suffered an Immobilsed or Weapon Destroyed result then there is a change the Techmarine can rekindle its angered war spirit and return it to the fight. To do this the Techmarine must start the Movement phase of the Space Marine turn in contact with the damaged vehicle and not be inside it (although he can disembark and begin the repairs), Falling Back, Locked in combat, or Pinned. Roll a D6 and if the result is a 6 then either a Weapon Destroyed or Immobilised result (owning player's choice) will be repaired. Both the vehicle and the Techmarine (including any unit he leads or has joined) must remain stationary for the entire Movement phase. The repair attempt will be complete before the Shooting phase begins.

Space Marines automatically pass Morale tests to regroup, and can take such tests even if the squad has been reduced to less than 50% by casualties, though all other criteria apply. If Space Marines are caught by a sweeping advance, they are not destroyed and will instead continue to fight normally. If this happens, then the unit is subject to the No Retreat! rule in this round of close combat and may therefore lose additional casualties if outnumbered. Usually troops that regroup may not move normally and always count as moving whether they do or not, but these restrictions do not apply to models with this special rule.
Units that include Servitors and Familiars are still subject to this rule as long as the unit contains at least one Space Marine.
Space Marines are still subject to Last Man Standing tests. They will always regroup after each Fall Back move to 'reassess' the situation however.

This special rule applies to all Dark Angels with the exception of the Deathwing, who are already Stubborn, and members of the Ravenwing. Intractable models that fail a Morale check as a result of taking 25% casualties in the enemy Shooting phase will not fall back as per the normal Morale rules. Instead, they will not be able to move in their next Movement phase, or assault in their next Assault phase, but may fire as per the normal shooting rules. All other Morale checks are taken in accordance with the rules given in the Warhammer 40,000 rulebook.