Coast Guard Cutter Polar Star sits on blocks while the cutter undergoes depot-level maintenance in a dry dock facility in Vallejo, Calif., in preparation for the cutter’s future polar-region patrol, April 16, 2018. The current polar icebreaking fleet provides the minimum capacity to meet the nation's most critical icebreaking needs but does not facilitate year-round access to the Polar regions or self-rescue. U.S. Coast Guard photo by Petty Officer 1st Class Matthew S. Masaschi.