Department of Homeland Security: Arctic Icebreaking Capabilities (Fiscal Year 2016 Report to Congress) [open pdf - 419KB]
"The U.S. Coast Guard Arctic Strategy (published May 2013) aligns with the National Strategy for the Arctic Region and aims to ensure safe, secure, and environmentally responsible maritime activity in the Arctic. Polar icebreakers support evolving strategic goals for the U.S. Arctic, including mapping the extended continental shelf, monitoring our borders, protecting natural resources, and fulfilling international commitments for emergency response in this region. Pursuant to 14 U.S.C. § 2, the Coast Guard shall develop, establish, maintain, and operate icebreaking facilities for (1) the promotion of safety on, under, and over the high seas and waters subject to the jurisdiction of the United States and (2) as specified in international agreements. In the Polar Regions, the Coast Guard's icebreaking operations are currently carried out by one medium polar icebreaker, the Coast Guard Cutter (CGC) HEALY and one heavy polar icebreaker, CGC POLAR STAR."
U.S. Department of Homeland Security: http://www.dhs.gov/