The Deputy Disbursing Officer and the several assistant disbursing officers each shall have authority:
(1) To make disbursements as an agent of the Disbursing Officer, District of Columbia;
(2) To sign checks drawn against disbursing accounts of the Disbursing Officer, District of Columbia, with the Treasurer of the United States; and
(3) To discharge all other duties required according to law or regulation to be performed by the Disbursing Officer, District of Columbia.