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The current secretary of defense is Robert Gates. The role of the Secretary of Defense is to be the principal defense policy advisor to the President and is responsible for thâ¦e formulation of general defense policy related to all matters of direct and primary concern to the Department of Defense, and for the execution of approved policy.
United States Department of Defense. Office of the Secretary of Defense. The Secretary of Defense (SecDef) is the leader and chief executive officer of the Department of Defense, an Executive Department of the Government of the United States of America.