; relating to access to classified information). (6) To ensure reciprocal recognition of eligibility for access to classified information or eligibility to hold a sensitive position among Federal agencies, including acting as the final authority to arbitrate and resolve disputes among such agencies involving the reciprocity of investigations and adjudications of eligibility. (7) To execute all other duties assigned to the Security Executive Agent by law. (c) Authorities The Security Executive Agent shall— (1) issue guidelines and instructions to the heads of Federal agencies to ensure appropriate uniformity, centralization, efficiency, effectiveness, timeliness, and security in processes relating to determinations by such agencies of eligibility for access to classified information or eligibility to hold a sensitive position, including such matters as investigations, polygraphs, adjudications, and reciprocity; (2) have the authority to grant exceptions to, or waivers of, national security investigative requirements, including issuing implementing or clarifying guidance, as necessary; (3) have the authority to assign, in whole or in part, to the head of any Federal agency (solely or jointly) any of the duties of the Security Executive Agent described in subsection (b) or the authorities described in paragraphs (1) and (2), provided that the exercise of such assigned duties or authorities is subject to the oversight of the Security Executive Agent, including such terms and conditions (including approval by the Security Executive Agent) as the Security Executive Agent determines appropriate