From time to time the Surgeon General may order examinations to be held in such professions or specialties within professions and for such grades as he deems necessary for the purpose of providing merit rolls of eligible candidates for appointment in the Regular Corps and shall, if a professional examination is to be required, prescribe the subjects relating to each profession or specialty within such profession in which candidates will be examined.

[21 FR 9806, Dec. 12, 1956, as amended at 24 FR 1790, Mar. 12, 1959]