And They Shall Know No Fear
(Rule)Description: Space Marines automatically pass tests to regroup, and can take such tests even if the squad has been reduced to less than half strength by casualties, though all other criteria apply. Usually troops that regroup cannot move normally and always count as moving whether they do or not, but these restrictions do not apply to models subject to this special rule. 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 might therefore suffer additional casualties.
Units which include Servitors are still subject to this rule, providing that the unit contains at least one Space Marine.