The Crusader's Helm

The wearer of the Crusader’s Helm increases the range of its aura abilities by 3" (to a maximum of 12"). In addition, at the start of your Movement Phase, select one BLACK TEMPLARS unit that has a Combat Doctrine ability within 6" of this model. Until the start of your next Movement Phase, the Assault Doctrine becomes active for that unit, replacing the currently active Combat Doctrine