The position "Secretary of Defense" refers to the lead executive role in the United States Department of Defense. As a result, synonyms for this title may revolve around key responsibilities of the position. These might include "chief of defense," "defense minister," "head of national security," or "chief strategist for national defense." Other synonyms may be more job-specific, such as "commander-in-chief" or "military advisor." Ultimately, regardless of the phrasing, the overarching responsibilities of the Secretary of Defense are underscored by one fundamental goal: the protection and security of the United States and its allies.