; (ii) 3 shall be appointed by the President from among individuals from academic or research institutions with expertise in global health policy, foreign relations, or public health emergencies; and (iii) 3 shall be appointed by the President from among individuals from the international development community with expertise in health, community, or economic development; and (B) 2 nonvoting, ex officio members, of whom— (i) 1 shall be the President of the National Academy of Medicine; and (ii) 1 shall be an employee of the Government Accountability Office who shall be appointed by the Comptroller General of the United States. (3) Staff group (A) Composition The staff group described in paragraph (1)(C) shall be composed of representatives of the National Security Council, the global health implementing agencies, the Government Accountability Office, and the National Academy of Medicine, as designated by the head of the respective agency. (B) Function The staff group shall advise, provide subject-matter expertise to, and support the activities of, the Commission. (e) Periods of appointment; vacancies (1) Periods of appointment (A) Governmental officials Each member of the principal group appointed under subsection (d)(2)(A)(i) shall serve at the discretion of the head of the respective agency. (B) Nongovernmental officials Each member of the principal group appointed under clause (ii) or (iii) of subsection (d)(2)(A) shall serve for a period of not fewer than 2 years and not more than 5 years. (2) Vacancies A vacancy in the Commission— (A) shall not affect the powers of the Commission