shall assign to the United States Army Reserve Command all forces of the Army Reserve in the continental United States other than forces assigned to the unified combatant command for special operations forces established pursuant to section 167 of this title; and

except as otherwise directed by the Secretary of Defense in the case of forces assigned to carry out functions of the Secretary of the Army specified in section 7013 of this title, shall assign all such forces of the Army Reserve to the commander of the United States Atlantic Command.