The mission of the Office of the Assistant Secretary of Defense for Homeland Defense and Hemispheric Affairs is to provide policy and planning oversight for DoD homeland defense and mission assurance, defense support of civil authorities, Arctic and Global Resilience, and Western Hemisphere Affairs matters. Advance and represent priority issues with U.S. interagency partners; U.S. Congress; Allies and partners; U.S. state, local, territorial, and tribal governments; and private section organizations.