The Secretary of the Treasury is authorized to appoint, in the service established by section
2071 of this title, one assistant commissioner, three deputy commissioners, one chief clerk, and such attorneys and other officers and employees as he may deem necessary. One of the deputy commissioners of the United States Customs Service shall have charge of investigations. Appointments under this subsection shall be subject to the provisions of the civil service laws, and the salaries shall be fixed in accordance with chapter
51 and subchapter
III of chapter
53 of title
5.