The flag may also be required to fly at half-mast upon the death of other persons to be determined by the National Historical Institute, for a period less than seven days. The flag shall be flown at half-mast on all the buildings and places where the decedent was holding office, on the day of death until the day of interment of an incumbent member of the Supreme Court, the Cabinet, the Senate or the House of Representatives, and such other persons as may be determined by the National Historical Commission.