((a)) Except as provided in subsection (c), a person is entitled, upon application, to retired pay computed under , if the person—

((1)) has attained the eligibility age applicable under subsection (f) to that person;

((2)) has performed at least 20 years of service computed under ;

((3)) in the case of a person who completed the service requirements of paragraph (2) before , performed the last six years of qualifying service while a member of any category named in , but not while a member of a regular component, the Fleet Reserve, or the Fleet Marine Corps Reserve, except that in the case of a person who completed the service requirements of paragraph (2) before , the number of years of such qualifying service under this paragraph shall be eight; and

((4)) is not entitled, under any other provision of law, to retired pay from an armed force or retainer pay as a member of the Fleet Reserve or the Fleet Marine Corps Reserve.

((b)) Application for retired pay under this section must be made to the Secretary of the military department, or the Secretary of Homeland Security, as the case may be, having jurisdiction at the time of application over the armed force in which the applicant is serving or last served.

((c))

((1)) A person who, before , was a Reserve of an armed force, or a member of the Army without component or other category covered by except a regular component, is not eligible for retired pay under this chapter unless—

((A)) the person performed active duty during World War I or World War II; or

((B)) the person performed active duty (other than for training) during the Korean conflict, the Berlin crisis, or the Vietnam era.

((2)) In this subsection:

((A)) The term “World War I” means the period beginning on , and ending on .

((B)) The term “World War II” means the period beginning on , and ending on .

((C)) The term “Korean conflict” means the period beginning on , and ending on .

((D)) The term “Berlin crisis” means the period beginning on , and ending on .

((E)) The term “Vietnam era” means the period beginning on , and ending on .

((d)) The Secretary concerned shall notify each person who has completed the years of service required for eligibility for retired pay under this chapter. The notice shall be sent, in writing, to the person concerned within one year after the person completes that service. The notice shall include notice of the elections available to such person under the Survivor Benefit Plan established under subchapter II of chapter 73 of this title and the Supplemental Survivor Benefit Plan established under subchapter III of that chapter, and the effects of such elections.

((e)) Notwithstanding , the date of entitlement to retired pay under this section shall be the date on which the requirements of subsection (a) have been completed.

((f))

((1)) Subject to paragraph (2), the eligibility age for purposes of subsection (a)(1) is 60 years of age.

((2))

((A)) In the case of a person who as a member of the Ready Reserve serves on active duty or performs active service described in subparagraph (B) after , the eligibility age for purposes of subsection (a)(1) shall be reduced, subject to subparagraph (C), below 60 years of age by three months for each aggregate of 90 days on which such person serves on such active duty or performs such active service in any fiscal year after , or in any two consecutive fiscal years after . A day of duty may be included in only one aggregate of 90 days for purposes of this subparagraph.

((B))

((i)) Service on active duty described in this subparagraph is service on active duty pursuant to a call or order to active duty under section 12301(d) or 12304b of this title, or under a provision of law referred to in . Such service does not include service on active duty pursuant to a call or order to active duty under .

((ii)) Active service described in this subparagraph is also service under a call to active service authorized by the President or the Secretary of Defense under for purposes of responding to a national emergency declared by the President or supported by Federal funds.

((iii)) If a member described in subparagraph (A) is wounded or otherwise injured or becomes ill while serving on active duty pursuant to a call or order to active duty under a provision of law referred to in the first sentence of clause (i) or in clause (ii), and the member is then ordered to active duty under to receive medical care for the wound, injury, or illness, each day of active duty under that order for medical care shall be treated as a continuation of the original call or order to active duty for purposes of reducing the eligibility age of the member under this paragraph.

((iv)) Service on active duty described in this subparagraph is also service on active duty pursuant to a call or order to active duty authorized by the Secretary of Homeland Security under section 712  of title 14 for purposes of emergency augmentation of the Regular Coast Guard forces.

((C)) The eligibility age for purposes of subsection (a)(1) may not be reduced below 50 years of age for any person under subparagraph (A).

((3)) The Secretary concerned shall periodically notify each member of the Ready Reserve described by paragraph (2) of the current eligibility age for retired pay of such member under this section, including any reduced eligibility age by reason of the operation of that paragraph. Notice shall be provided by such means as the Secretary considers appropriate taking into account the cost of provision of notice and the convenience of members.