((a)) ** .—** In computing—
((1)) the retired pay of a member of a uniformed service who is entitled to that pay under any provision of law other than—
((A)) chapter 61 of this title (relating to retirement or separation for physical disability); or
((B)) chapter 1223 of this title (relating to retirement for non-regular service); or
((2)) the retainer pay of a member who is transferred to the Fleet Reserve or the Fleet Marine Corps Reserve under ,
((b))
((1)) ** .—** Subject to paragraphs (2) and (3), the percentage to be used under subsection (a) is the product (stated as a percentage) of—
((A)) 2½, and
((B)) the member’s years of creditable service (as defined in subsection (c)).
((2)) ** .—** In the case of a member who first became a member of a uniformed service after , has elected to receive a bonus under section 322 (as in effect before the enactment of the National Defense Authorization Act for Fiscal Year 2008) or , has less than 30 years of creditable service, and is under the age of 62 at the time of retirement, the percentage determined under paragraph (1) shall be reduced by—
((A)) 1 percentage point for each full year that the member’s years of creditable service are less than 30; and
((B)) ⁄ of 1 percentage point for each month by which the member’s years of creditable service (after counting all full years of such service) are less than a full year.
((3)) **30**
((A)) ** .—** In the case of a member who retires before , with more than 30 years of creditable service, the percentage to be used under subsection (a) is 75 percent.
((B)) ** .—** In the case of a member who retires after , with more than 30 years of creditable service, the percentage to be used under subsection (a) is the sum of—
((i)) 75 percent; and
((ii)) the product (stated as a percentage) of—
((I)) 2½; and
((II)) the member’s years of creditable service (as defined in subsection (c)) in excess of 30 years of creditable service, under conditions authorized for purposes of this subparagraph during a period designated by the Secretary of Defense for purposes of this subparagraph.
((4))
((A)) ** .—** Notwithstanding paragraphs (1), (2), and (3), in the case of a member who first becomes a member of the uniformed services on or after , or a member who makes the election described in subparagraph (B) (referred to as a “full TSP member”)—
((i)) paragraph (1)(A) shall be applied by substituting “2” for “2½”;
((ii)) clause (i) of paragraph (3)(B) shall be applied by substituting “60 percent” for “75 percent”; and
((iii)) clause (ii)(I) of such paragraph shall be applied by substituting “2” for “2½”.
((B)) ** .—** Pursuant to subparagraph (C), a member of a uniformed service serving on , who has served in the uniformed services for fewer than 12 years as of , may elect, in exchange for the reduced multipliers described in subparagraph (A) for purposes of calculating the retired pay of the member, to receive Thrift Savings Plan contributions pursuant to .
((C))
((i)) ** .—** Except as provided in clauses (ii), (iii), (iv), and (v), a member of a uniformed service described in subparagraph (B) may make the election authorized by that subparagraph only during the period that begins on , and ends on .
((ii)) ** .—** The Secretary concerned may extend the election period described in clause (i) for a member who experiences a hardship as determined by the Secretary concerned.
((iii)) ** .—** A member of a uniformed service who returns to service after a break in service that occurs during the election period specified in clause (i) shall make the election described in subparagraph (B) within 30 days after the date of the reentry into service of the member.
((iv)) ** .—** A member of a uniformed service who serves as a cadet, midshipman, or member of the Senior Reserve Officers’ Training Corps during the election period specified in clause (i) shall make the election described in subparagraph (B)—
((I)) on or after the date on which such cadet, midshipman, or member of the Senior Reserve Officers’ Training Corps is appointed as a commissioned officer or otherwise begins to receive basic pay; and
((II)) not later than 30 days after such date or the end of such election period, whichever is later.
((v)) ** .—** A member of a reserve component who is not in an active status during the election period specified in clause (i) shall make the election described in subparagraph (B)—
((I)) on or after the date on which such member is transferred from an inactive status to an active status or active duty; and
((II)) not later than 30 days after such date or the end of such election period, whichever is later.
((D)) ** .—** Thrift Savings Plan contributions may not be made for a member making an election pursuant to subparagraph (B) for any period beginning before the date of the member’s election under that subparagraph by reason of the member’s election.
((E)) ** .—** The Secretary concerned shall prescribe regulations to implement this paragraph.
((c)) ** .—** In this section, the term “years of creditable service” means the number of years of service creditable to a member in computing the member’s retired or retainer pay (including ⁄ of a year for each full month of service that is in addition to the number of full years of service of the member).