The agency head or, in the case of an independent Presidential advisory committee, the Secretariat, must designate a Federal officer or employee who must be either full-time or permanent part-time, to be the DFO for each advisory committee and its subcommittees, who must:

(a) Approve or call the meeting of the advisory committee or subcommittee;

(b) Approve the agenda, except that this requirement does not apply to a Presidential advisory committee;

(c) Attend the meetings;

(d) Adjourn any meeting when he or she determines it to be in the public interest; and

(e) Chair the meeting when so directed by the agency head.