; (B) overlapping territorial claims; and (C) the potential for maritime accidents, oil spills, and illegal fishing near the exclusive economic zone of the United States. (12) The increasing role of the United States in the Arctic has been highlighted in each of the last four National Defense Authorization Acts. (13) Section 1068 of the National Defense Authorization Act for Fiscal Year 2016 ( Public Law 114–92 ; 129 Stat. 992) required a new Department of Defense strategy to protect United States national security interests in the Arctic region. (14) Section 1095 of the National Defense Authorization Act for Fiscal Year 2017 ( Public Law 114–328 ; 130 Stat. 2438) required the Department of Defense to create criteria to designate a Department of Defense Strategic Arctic Port. (15) Section 122 of the National Defense Authorization Act for Fiscal Year 2018 ( Public Law 115–91 ; 131 Stat. 1310) authorized the procurement of one polar-class heavy icebreaker vessel. (16) Section 151 of the John S. McCain National Defense Authorization Act for Fiscal Year 2019 ( Public Law 115–232 ) authorized the procurement of five additional polar-class icebreaker vessels and expressed that the Coast Guard should— (A) maintain an inventory of not fewer than six polar-class icebreaker vessels; (B) award a contract for the first new polar-class icebreaker not later than fiscal year 2019 and deliver the icebreaker not later than fiscal year 2023; and (C) deliver the second through sixth polar-class icebreakers at a rate of one vessel per year in fiscal years 2025 through 2029. (17) In January 2017, the Department of Defense released a report entitled Report to Congress on Strategy to Protect United States National Security Interests in the Arctic Region to update the ways and means the Department of Defense intends to use to achieve its objectives as it implements the 2013 National Strategy for the Arctic Region, including— (A) enhancing the capability of United States forces to defend the homeland and exercise sovereignty