Each personnel authority of an agency of the District shall designate a person to administer the oath of office to each employee of that agency. The oath shall be as follows:
“I, (employee’s name) do solemnly swear (or affirm) that I will faithfully execute the laws of the United States of America and of the District of Columbia, and will, to the best of my ability, preserve, protect and defend the Constitution of the United States, and will faithfully discharge the duties of the office on which I am about to enter.”