Hardened Veterans

The unit may ignore negative modifiers for Morale checks and tests for regrouping. In effect, the unit will always use its standard Leadership for these tests.

The unit may attempt to regroup even when below 50%

Savlar Chem-Dogs may never make a sweeping advance after a combat.

Savlar Chem-Dogs ignore negative modifiers to their Morale checks, and will test on the unmodified Leadership of the unit or character that is leading it all times.
In addition, if they do fail a Morale check, they will become pinned instead of falling back. However, they fall back in close combat as normal.