The objective of this joint audit was to determine whether the Coast Guard implemented cybersecurity controls to protect Coast Guard systems operating on the Department of Defense (DoD) Information Network (DODIN) in accordance with applicable cybersecurity requirements. The Coast Guard must comply with DoD cybersecurity requirements because its systems operate on the DODIN. The Coast Guard’s roles and responsibilities for operating its systems on the DODIN are set forth in a series of memorandums between the DoD and the Department of Homeland Security (DHS).