Priority Doctrine Adoption

Use this Stratagem in your Command phase.
Select one DEATHWATCH unit from your
army, then select one combat doctrine. Until
the start of your next Command phase, that
unit gains the bonus of the combat doctrine
you selected instead of the active combat
doctrine. You can only use this Stratagem if
every unit from your army has the
DEATHWATCH keyword (excluding
AGENT OF THE IMPERIUM and
UNALIGNED units).