(f) Practical tests.
Other competitive examinations.—Such other competitive examinations as the Commission may from time to time determine to be necessary in testing fitness for other places in the classified customs service.
Noncompetitive examinations.—Such examinations may, with the approval of the Commission, be held under conditions stated in General Rule III, clause 2.
2. Any person not under 21 years of age may be examined for anyplace in the customs service to test fitness for which an examination is prescribed, and any person not under 20 years of age may be examined for clerk or messenger.
3. A person desiring examination for admission to the classified customs service must make request, in his own handwriting, for a blank form of application, which request and also his application shall be addressed as directed by the Commission.
4. The date of reception and also of approval by the board of each of such applications shall be noted on the application paper.
5. Exceptions from examination in the classified customs service are hereby made as follows:
(a) Deputy collectors, who do not also act as inspectors, examiners, or clerks.
(b) Cashier of the collector.
(c) Assistant cashier of the collector.