position. (4) Unless otherwise designated by law, to serve as the final authority to designate a Federal agency or agencies to conduct investigations of persons who are proposed for access to classified information or for eligibility to hold a sensitive position to ascertain whether such persons satisfy the criteria for obtaining and retaining access to classified information or eligibility to hold a sensitive position, as applicable. (5) Unless otherwise designated by law, to serve as the final authority to designate a Federal agency or agencies to determine eligibility for access to classified information or eligibility to hold a sensitive position in accordance with Executive Order 12968 of August 2, 1995, as amended. (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