Department of Homeland Security: Assessment of Air and Marine Operating Locations Should Include Comparable Costs Across All DHS Marine Operations, Report to Congressional Committees [open pdf - 4MB]
From the Highlights: "DHS's operational components, primarily AMO [Air and Marine Operations and Border Patrol within CBP [U.S Customs and Border Protection] and Coast Guard, use aircraft and vessels to secure U.S. borders, support criminal investigations, and ensure maritime security and safety. Since DHS began operations in 2003, it has examined opportunities to integrate and coordinate CBP and Coast Guard air and marine operations, including identifying opportunities for potential efficiencies such as consolidation of operating locations. The FAA [Federal Aviation Administration] Reauthorization Act of 2018 included a provision for GAO [Government Accountability Office] to review DHS's air and marine operations. This report examines, among other things, (1) CBP and Coast Guard air and marine mission activities across operating locations and (2) DHS assessments of components' operating locations for air and marine mission activities."
Government Accountability Office: https://www.gao.gov/