The US Naval Institute has published another report by Congress’s Naval Adviser in residence, Ronald O’Rourke, This one addresses the problems of modernizing the Icebreaker fleet. This is an excellent review of the current situation and the alternatives.
Chuck Hill's CG Blog 
Pingback: New Icebreaker–For the Great Lakes? | Chuck Hill's CG Blog
“Today, U.S. Senators Maria Cantwell (D-WA) and Lisa Murkowski (R- AK) introduced the Icebreaker Recapitalization Act. The bill would authorize the U.S. Navy to construct up to 6 heavy icebreakers. The new icebreakers would be designed and operated by the Coast Guard. The Coast Guard is the sole service responsible for icebreaking missions.”
http://www.cantwell.senate.gov/public/index.cfm/2015/5/cantwell-murkowski-introduce-bill-to-recapitalize-icebreaker-fleet
Click to access 5%2019%2015%20Icebreaker%20Recapitalization%20Act.pdf
The Commandant is trying to make the case for more icebreakers. http://www.businessinsider.com/us-not-even-in-the-same-league-as-russia-in-arctic-2015-7?utm_content=bufferb79ac&utm_medium=social&utm_source=facebook.com&utm_campaign=buffer
Here’s an interesting article about upcoming polar research and supply ships:
http://www.motorship.com/news101/ships-and-shipyards/a-new-age-of-polar-research
I don’t see US mentioned anywhere…
Federal officials consider leasing icebreakers as budget reality sinks in:
https://www.adn.com/article/20150715/federal-officials-consider-leasing-icebreakers-budget-reality-sinks