(a) Each officer of the Regular Coast Guard serving in the grade of captain whose name is not carried on an approved list of officers selected for promotion to the grade of rear admiral (lower half) shall, unless retired under some other provision of law, be retired on June 30 of the promotion year in which he, or any captain junior to him on the active duty promotion list who has not lost numbers or precedence, completes thirty years of active commissioned service in the Coast Guard. An officer advanced in precedence on the active duty promotion list because of his promotion resulting from selection for promotion from below the zone is not subject to involuntary retirement under this section earlier than if he had not been selected from below the zone.

(b) Retired pay computed under section 423(a) of this title of an officer retired under this section shall not be less than 50 percent of the basic pay upon which the computation of his retired pay is based.

(Added Pub. L. 88–130, §1(10)(C), Sept. 24, 1963, 77 Stat. 185; amended Pub. L. 93–283, §1(8), May 14, 1974, 88 Stat. 140; Pub. L. 94–546, §1(25), Oct. 18, 1976, 90 Stat. 2521; Pub. L. 96–342, title VIII, §813(f)(1), Sept. 8, 1980, 94 Stat. 1109; Pub. L. 97–417, §2(7), Jan. 4, 1983, 96 Stat. 2085; Pub. L. 99–348, title II, §205(b)(4), July 1, 1986, 100 Stat. 700; Pub. L. 99–661, div. A, title XIII, §1343(c), Nov. 14, 1986, 100 Stat. 3995.)

**1986**—Subsec. (a). Pub. L. 99–661 substituted “rear admiral (lower half)” for “commodore”.

Subsec. (b). Pub. L. 99–348 substituted “Retired pay computed under section 423(a) of this title” for “Except as provided in section 423(b) of this title, the retired pay”.

**1983**—Subsec. (a). Pub. L. 97–417 substituted “commodore” for “rear admiral”.

**1980**—Subsec. (b). Pub. L. 96–342 substituted “Except as provided in section 423(b)” for “Notwithstanding section 423”.

**1976**—Subsec. (a). Pub. L. 94–546 substituted “promotion year” for “fiscal year”.

**1974**—Subsec. (a). Pub. L. 93–283 prohibited an involuntary retirement under this section of an officer advanced in precedence on the active duty promotion list because of his promotion resulting from selection for promotion from below the zone earlier than if he had not been selected from below the zone.

Amendment by Pub. L. 93–283 effective Sept. 24, 1963, see section 2 of Pub. L. 93–283, set out as a note under section 214 of this title.

Savings provisions in section 5(f)–(h) of Pub. L. 88–130 relating to retirement, retirement pay, and election, change or revocation of election of an annuity, are set out as a note under section 211 of this title.

Section 3(a) of Pub. L. 88–130 excluded officers subject to retirement under this section during the fiscal year the selection board convened from being continued on active duty.