At the start of your Command phase, you can select one of the Hunting Packs listed below. Until the start of your next Command phase, that Hunting Pack is active and its effects apply to all ADEPTUS ASTARTES units from your army. You can only select each Hunting Pack once per battle.
Once per battle, when selecting a Hunting Pack for the Master of Wolves Detachment rule (see above), if a LOGAN GRIMNAR model from your army is on the battlefield, you can select a Hunting Pack you have already selected this battle.