than 5, and not more than 25, members appointed by the Under Secretary. (B) Expertise Each member of the Board shall have cybersecurity or supply chain security technical expertise, cybersecurity or supply chain security policy expertise, or expertise in managing or overseeing the cybersecurity or supply chain security functions of a business. (C) Representation In appointing members of the Board under subparagraph (A), the Under Secretary shall ensure that the members appointed provide a balanced representation of the following: (i) Chief cybersecurity officers or other qualified individuals employed in cybersecurity positions, representing both the public and private sectors. (ii) Persons who operate or maintain information and communications networks, including persons who operate or maintain small or rural information and communications networks. (iii) Vendors that produce or provide equipment used in information and communications networks. (iv) Vendors that produce or provide software used in information and communications networks. (v) Persons who operate or maintain internet applications. (2) Terms (A) In general Except as provided in subparagraphs (C) and (D), each member of the Board shall be appointed for a term of a length not to exceed 2 years, to be determined by the Under Secretary. (B) Reappointment A member of the Board, including a member appointed to fill a vacancy as provided in subparagraph (D), may be reappointed for 1 or more additional terms by the Under Secretary. (C) Removal The Under Secretary may remove a member of the Board at the discretion of the Under Secretary. (D) Vacancy Any member of the Board appointed to fill a vacancy occurring before the expiration of the term for which the predecessor of the member was appointed shall be appointed only for the remainder of such term. A vacancy in the Board shall be filled in the manner in which the original appointment was made. (3) Chair The Chair of the Board shall be the Associate Administrator of the NTIA for Policy Development and