U.S. Coast Guard’s New Icebreaker ’Storis’ Departs on Maiden Voyage Bolstering Presence in Arctic The U.S. Coast Guard has taken a first key step in strengthening its Arctic posture. IcebreakerStorisis joining the USCG fleet after a six months conversion process to turn the commercial ice-capable supply vessel into an icebreaker. The vessel will be a key interim asset while the U.S. awaits construction of the new heavy polar icebreaker.