Subsection (a) of section 333 of the Public Health Service Act ( 42 U.S.C. 254f ) is amended by adding at the end the following new paragraph: (4) During an emergency period (as defined in section 1135(g)(1) of the Social Security Act, the Secretary may, notwithstanding this subpart and subpart III, assign members of the Corps to provide such health services at such places and for such number of hours as the Secretary determines necessary to respond to the emergency, provided that— (A) the members voluntarily agree to such assignment and hours