; 120 Stat 1884) is amended— (1) in section 1(b), by striking the item relating to section 502; and (2) by striking section 502 ( 6 U.S.C. 592a ). 102. Rule of construction Nothing in this title or the amendments made by this title may be construed as modifying any existing authority under any provision of law not expressly amended by this title. II Office of Health Security 201. Office of Health Security (a) Establishment The Homeland Security Act of 2002 ( 6 U.S.C. 101 et seq. ) is amended— (1) in section 103 ( 6 U.S.C. 113 )— (A) in subsection (a)(2)— (i) by striking the Assistant Secretary for Health Affairs, ; and (ii) by striking Affairs, or and inserting Affairs or ; and (B) in subsection (d), by adding at the end the following: (6) A Chief Medical Officer. ; (2) by adding at the end the following: XXIII Office of Health Security ; (3) by redesignating section 1931 ( 6 U.S.C. 597 ) as section 2301 and transferring such section to appear after the heading for title XXIII, as added by paragraph (2); (4) in section 2301, as so redesignated— (A) in the section heading, by striking Chief Medical Officer and inserting Office of Health Security ; (B) by striking subsections (a) and (b) and inserting the following: (a) In general There is established in the Department an Office of Health Security. (b) Head of Office of Health Security The Office of Health Security shall be headed by a chief medical officer, who shall— (1) be the Assistant Secretary for Health Security and the Chief Medical Officer of the Department; (2) be a licensed physician possessing a demonstrated ability in and knowledge of medicine and public health; (3) be appointed by the President; and (4) report directly to the Secretary. ; (C) in subsection (c)— (i) in the matter preceding paragraph (1), by striking medical issues related to natural disasters, acts of terrorism, and other man-made disasters and inserting medical activities of the Department and all workforce-focused health and safety activities of the Department