((a)) ** Permanent or temporary promotions; examination** Promotions of officers of the Regular Corps to any grade up to and including the director grade shall be either permanent promotions based on length of service, other permanent promotions to fill vacancies, or temporary promotions. Permanent promotions shall be made by the President, and temporary promotions shall be made by the President. Each permanent promotion shall be to the next higher grade, and shall be made only after examination given in accordance with regulations of the President.

((b)) ** Promotion to certain grades only to fill vacancies; regulations; “restricted grade” defined** The President may by regulation provide that in a specified professional category permanent promotions to the senior grade, or to both the full grade and the senior grade, shall be made only if there are vacancies in such grade. A grade in any category with respect to which such regulations have been issued is referred to in this section as a “restricted grade”.

((c)) ** Examinations** Examinations to determine qualification for permanent promotions may be either noncompetitive or competitive, as the Surgeon General shall in each case determine; except that examinations for promotions to the assistant or senior assistant grade shall in all cases be noncompetitive. The officers to be examined shall be selected by the Surgeon General from the professional category, and in the order of seniority in the grade, from which promotion is to be recommended. In the case of a competitive examination the Surgeon General shall determine in advance of the examination the number (which may be one or more) of officers who, after passing the examination, will be recommended to the President for promotion; but if the examination is one for promotions based on length of service, or is one for promotions to fill vacancies other than vacancies in the director grade or in a restricted grade, such number shall not be less than 80 per centum of the number of officers to be examined.

((d)) ** Permanent promotions to qualified officers on length of service** Officers of the Regular Corps, found pursuant to subsection (c) to be qualified, shall be given permanent promotions based on length of service, as follows:

((1)) Officers in the warrant officer (W–1) grade, chief warrant officer (W–2) grade, chief warrant officer (W–3) grade, chief warrant officer (W–4) grade, and junior assistant grade shall be promoted at such times as may be prescribed in regulations of the President.

((2)) Officers with permanent rank in the assistant grade, the senior assistant grade, and the full grade shall (except as provided in regulations under subsection (b)) be promoted after completion of three, ten, and seventeen years, respectively, of service in grades above the junior assistant grade; and such promotions, when made, shall be effective, for purposes of pay and seniority in grade, as of the day following the completion of such years of service. An officer with permanent rank in the assistant, senior assistant, or full grade who has not completed such years of service shall be promoted at the same time, and his promotion shall be effective as of the same day, as any officer junior to him in the same grade in the same professional category who is promoted under this paragraph.

((e)) ** Promotion of professional category officers to fill certain vacancies** Officers in a professional category of the Regular Corps, found pursuant to subsection (c) to be qualified, may be given permanent promotions to fill any or all vacancies in such category in the senior assistant grade, the full grade, the senior grade, or the director grade; but no officer who has not had one year of service with permanent or temporary rank in the next lower grade shall be promoted to any restricted grade or to the director grade.

((f)) ** Reexamination upon failure of promotion; effective date of promotion** If an officer who has completed the years of service required for promotion to a grade under paragraph (2) of subsection (d) fails to receive such promotion, he shall (unless he has already been twice examined for promotion to such grade) be once reexamined for promotion to such grade. If he is thereupon promoted (otherwise than under subsection (e)), the effective date of such promotion shall be one year later than it would have been but for such failure. Upon the effective date of any permanent promotion of such officer to such grade, he shall be considered as having had only the length of service required for such promotion which he previously failed to receive.

((g)) ** Separation from service upon failure of promotion** If, for reasons other than physical disability, an officer of the Regular Corps in the warrant officer (W–1) grade or junior assistant grade is found pursuant to subsection (c) not to be qualified for promotion he shall be separated from the Service. If, for reasons other than physical disability, an officer of the Regular Corps in the chief warrant officer (W–2), chief warrant officer (W–3), assistant, senior assistant, or full grade, after having been twice examined for promotion (other than promotion to a restricted grade), fails to be promoted—

((1)) if in the chief warrant officer (W–2) or assistant grade he shall be separated from the Service and paid six months’ basic pay and allowances;

((2)) if in the chief warrant officer (W–3) or senior assistant grade he shall be separated from the Service and paid one year’s basic pay and allowances;

((3)) if in the full grade he shall be considered as not in line for promotion and shall, at such time thereafter as the Surgeon General may determine, be retired from the Service with retired pay (unless he is entitled to a greater amount by reason of another provision of law)—

((A)) in the case of an officer who first became a member of a uniformed service before , at the rate of 2½ percent of the retired pay base determined under for each year, not in excess of 30, of his active commissioned service in the Service; or

((B)) in the case of an officer who first became a member of a uniformed service on or after , at the rate determined by multiplying—

((i)) the retired pay base determined under ; by

((ii)) the retired pay multiplier determined under section 1409 of such title for the number of years of his active commissioned service in the Service.

((h)) ** Separation from service upon refusal to stand examination** If an officer of the Regular Corps, eligible to take an examination for promotion, refuses to take such examination, he may be separated from the Service in accordance with regulations of the President.

((i)) ** Review of record; separation from service** At the end of his first three years of service, the record of each officer of the Regular Corps originally appointed to the senior assistant grade or above, shall be reviewed in accordance with regulations of the President and, if found not qualified for further service, he shall be separated from the Service and paid six months’ pay and allowances.

((j)) ** Determination of order of seniority**

((1)) The order of seniority of officers in a grade in the Regular Corps shall be determined, subject to the provisions of paragraph (2) of this subsection, by the relative length of time spent in active service after the effective date of each such officer’s original appointment or permanent promotion to that grade. When permanent promotions of two or more officers to the same grade are effective on the same day, their relative seniority shall be the same as it was in the grade from which promoted. In all other cases of original appointments or permanent promotions (or both) to the same grade effective on the same day, relative seniority shall be determined in accordance with regulations of the President.

((2)) In the case of an officer originally appointed in the Regular Corps to the grade of assistant or above, his seniority in the grade to which appointed shall be determined after inclusion, as service in such grade, of any active service in such grade or in any higher grade in the Ready Reserve Corps, but (if the appointment is to the grade of senior assistant or above) only to the extent of whichever of the following is greater: (A) His active service in such grade or any higher grade in the Ready Reserve Corps after the first day on which, under regulations in effect on the date of his appointment to the Regular Corps, he had the training and experience necessary for such appointment, or (B) the excess of his total active service in the Ready Reserve Corps (above the grade of junior assistant) over three years if his appointment in the Regular Corps is to the senior assistant grade, over ten years if the appointment is to the full grade, or over seventeen years if the appointment is to the senior grade.

((k)) ** Temporary promotions; fill vacancy in higher grade; war or national emergency; selection of officers; termination of appointment** Any commissioned officer of the Regular Corps in any grade in any professional category may be recommended to the President for temporary promotion to fill a vacancy in any higher grade in such category, up to and including the director grade. In time of war, or of national emergency proclaimed by the President, any commissioned officer of the Regular Corps in any grade in any professional category may be recommended to the President for promotion to any higher grade in such category, up to and including the director grade, whether or not a vacancy exists in such grade. The selection of officers to be recommended for temporary promotions shall be made in accordance with regulations of the President. Promotion of an officer recommended pursuant to this subsection may be made without regard to length of service, without examination, and without vacating his permanent appointment, and shall carry with it the pay and allowances of the grade to which promoted. Such promotions may be terminated at any time, as may be directed by the President.

((l)) ** Determination of requirements of Service by Secretary; assignment of Reserve Officers to professional categories; temporary promotions; termination of temporary promotions** Whenever the number of officers of the Regular Corps on active duty, plus the number of officers of the Ready Reserve Corps who have been on active duty for thirty days or more, exceeds the authorized strength of the Regular Corps, the Secretary shall determine the requirements of the Service in each grade in each category, based upon the total number of officers so serving on active duty and the tasks being performed by the Service; and the Surgeon General shall thereupon assign each officer of the Ready Reserve Corps on active duty to a professional category. If the Secretary finds that the number of officers fixed under for any grade and category (or the number of officers, including officers of the Ready Reserve Corps, on active duty in such grade in such category, if such number is greater than the number fixed under ) is insufficient to meet such requirements of the Service, officers of either the Regular Corps or the Ready Reserve Corps may be recommended for temporary promotion to such grade in such category. Any such promotion may be terminated at any time, as may be directed by the President.section 210b(c) of this titlesection 210b(c) of this title

((m)) ** Acceptance of promotion; oath and affidavit** Any officer of the Regular Corps, or any officer of the Ready Reserve Corps on active duty, who is promoted to a higher grade shall, unless he expressly declines such promotion, be deemed for all purposes to have accepted such promotion; and shall not be required to renew his oath of office, or to execute a new affidavit as required by .section 3332 of title 5