Coast Guard Cutter Polar Star sits on blocks in a Vallejo, Calif., dry dock facility undergoing depot-level maintenance including inspections and repairs to critical cutter components prior to the cutter’s next patrol, April 16, 2018. As activity in the Polar Regions continues to grow, the Coast Guard maintains their aging icebreaking assets to protect U.S. security, environmental and economic interests in these regions of the world. U.S. Coast Guard photo by Petty Officer 1st Class Matthew S. Masaschi.