The nation's sole heavy icebreaker arrived in the Aleutians this week for the first time since 2013.
The U.S. Coast Guard's Polar Star is preparing to patrol Alaska's Arctic waters, including the maritime boundary line separating the U.S. and Russia.
The Polar Star sits in the Port of Dutch Harbor. The ship is nearly 400 feet long and can break ice up to 21 feet thick.
The ship arrived with 136 crew members on Tuesday for a pit stop 30 days into a months-long deployment to the Arctic to assert maritime sovereignty and security in the far north.