((a)) ** Age; voluntariness; length of service; computation of retired pay**
((1)) A commissioned officer of the Regular Corps shall, if he applies for retirement, be retired on or after the first day of the month following the month in which he attains the age of sixty-four years. This paragraph does not permit or require the involuntary retirement of any individual because of the age of the individual.
((2)) A commissioned officer of the Regular Corps may be retired by the Secretary, and shall be retired if he applies for retirement, on the first day of any month after completion of thirty years of active service.
((3)) Any commissioned officer of the Regular Corps who has had less than thirty years of active service may be retired by the Secretary, with or without application by the officer, on the first day of any month after completion of twenty or more years of active service of which not less than ten are years of active commissioned service in any of the uniformed services.
((4)) Except as provided in paragraph (6), a commissioned officer retired pursuant to paragraph (1), (2), or (3) who was on active duty with the Regular Corps on the day preceding such retirement shall be entitled to receive retired pay calculated by multiplying the retired pay base determined under by the retired pay multiplier determined under section 1409 of such title for the numbers of years of service credited to the officer under this paragraph and in which, in the case of a temporary promotion to such grade, he has performed active duty for not less than six months, (A) for each year of active service, or (B) if it results in higher retired pay, for each of the following years:
((i)) his years of active service (determined without regard to subsection (d)) as a member of a uniformed service; plus
((ii)) in the case of a medical or dental officer, four years and, in the case of a medical officer, who has completed one year of medical internship or the equivalent thereof, one additional year, the four years and the one year to be reduced by the period of active service performed during such officer’s attendance at medical school or dental school or during his medical internship; plus
((iii)) the number of years of service with which he was entitled to be credited for purposes of basic pay on , or (if higher) on any date prior thereto, reduced by any such year included under clause (i) and further reduced by any such year with which he was entitled to be credited under paragraphs (7) and (8) of on any date before ;
((5)) With the approval of the President, a commissioned officer whose service as Surgeon General, Deputy Surgeon General, or Assistant Surgeon General has totaled four years or more and who has had not less than twenty-five years of active service in the Regular Corps may retire voluntarily at any time; and except as provided in paragraph (6), his retired pay shall be at the rate of 75 per centum of the basic pay of the highest grade held by him as such officer.
((6)) The retired pay of a commissioned officer retired under this subsection who first became a member of a uniformed service after , is determined by multiplying—
((A)) the retired pay base determined under ; by
((B)) the retired pay multiplier determined under section 1409 of such title for the number of years of service credited to the officer under paragraph (4).
((7)) Retired pay computed under or under paragraph (4) or (5) of this subsection, if not a multiple of $1, shall be rounded to the next lower multiple of $1.
((b)) ** Basic pay of highest temporary grade** For purposes of subsection (a), the basic pay of the highest grade to which a commissioned officer has received a temporary promotion means the basic pay to which he would be entitled if serving on active duty in such grade on the date of his retirement.
((c)) ** Recall to active duty** A commissioned officer, retired for reasons other than for failure of promotion to the senior grade, may (1) if an officer of the Regular Corps entitled to retired pay under subsection (a) or under , be involuntarily recalled to active duty during such times as the Commissioned Corps constitutes a branch of the land or naval forces of the United States, and (2) if an officer of either the Regular Corps or Ready Reserve Corps, be recalled to active duty at any time with his consent.section 213a(a)(19) of this title
((d)) ** “Active service” defined** The term “active service”, as used in subsection (a), includes:
((1)) all active service in any of the uniformed services;
((2)) active service with the Public Health Service, other than as a commissioned officer, which the Surgeon General determines is comparable to service performed by commissioned officers of the Regular Corps, except that, if there are more than five years of such service only the last five years thereof may be included;
((3)) all active service (other than service included under the preceding provisions of this subsection) which is creditable for retirement purposes under laws governing the retirement of members of any of the uniformed services; and
((4)) service performed as a member of the Senior Biomedical Research Service established by , except that, if there are more than 5 years of such service, only the last 5 years thereof may be included.
((e)) ** Crediting of part of year** For the purpose of determining the number of years by which a percentage of the basic pay of an officer is to be multiplied in computing the amount of his retired pay pursuant to or paragraph (4) of subsection (a) of this section, each full month of service that is in addition to the number of full years of service credited to an officer is counted as one-twelfth of a year and any remaining fractional part of a month is disregarded.section 211(g)(3) of this title
((f)) ** Retirement or separation for physical disability** For purposes of retirement or separation for physical disability under chapter 61 of title 10, a commissioned officer of the Regular Corps shall be credited, in addition to the service described in section 1208(a)(2) of that title, with active service with the Public Health Service, other than as a commissioned officer, which the Surgeon General determines is comparable to service performed by commissioned officers of the Regular Corps, except that, if there are more than five years of such service, only the last five years thereof may be so credited. For such purposes, such section 1208(a)(2) shall be applicable to officers of the Regular Corps.