less often than 4 times per year, including virtual meetings called to order by either the entire Commission or any member thereof. (5) Quorum More than half of the total members of the Commission shall constitute a quorum for the purposes of holding a meeting in compliance with subsection (d)(4), but a lesser number may hold hearings. (6) Chair and vice chair The Commission shall elect a Chair and Vice Chair from among its members. The term of office of each shall be for the life of the Commission. (7) Compensation Each member of the Commission who is not an officer or employee of the Federal Government shall be compensated at a rate equal to the daily equivalent of the annual rate of basic pay prescribed for level IV of the Executive Schedule under section 5315 of title 5, United States Code, for each day (including travel time) during which such member is engaged in the performance of the duties of the Commission. All members of the Commission who are officers or employees of the United States shall serve without compensation in addition to that received for their services as officers or employees of the United States. (8) Travel expenses The members of the Commission shall be allowed travel expenses, including per diem in lieu of subsistence, at rates authorized for employees of agencies under subchapter I of chapter 57 of title 5, United States Code, while away from their homes or regular places of business in the performance of the duties of the Commission. (e) Powers of the commission (1) Hearings and sessions The Commission may, for the purpose of carrying out the provisions of this section, hold such hearings and sit and act at such times and at such places in the United States, and request the attendance and testimony of such witnesses and the production of such books, records, correspondence, memoranda, papers, and documents, as the Commission considers appropriate. The Commission may invoke the aid of an appropriate United States district court to require, by subpoena or otherwise, such attendance,