Source: https://www.law.cornell.edu/uscode/text/37/211
Timestamp: 2019-04-22 14:20:32+00:00

Document:
a member of the Ready Reserve in any pay status.
Any member may participate in the Thrift Savings Plan in accordance with section 8440e of title 5.
an appointment to a position covered by chapter 83 or 84 of title 5 or an equivalent retirement system, as identified by the Executive Director (appointed by the Federal Retirement Thrift Investment Board) in regulations.
Transfer of the member to inactive status, or to a retired list pursuant to any provision of title 10.
If a loan is issued to a member under section 8433(g) of title 5 from funds in the member’s account in the Thrift Savings Plan, repayment of the loan may be required on the same semi-monthly basis as authorized for contributions to the Thrift Savings Fund on behalf of the member under section 1014(c) of this title.
2015—Subsecs. (d), (e). Pub. L. 114–92 redesignated subsec. (e) as (d) and struck out former subsec. (d) which related to agency contributions for retention in critical specialties and first-time enlistees.
2006—Subsec. (d). Pub. L. 109–163, § 605(b), inserted “and First-Time Enlistees” after “Specialties” in heading.
Subsec. (d)(1). Pub. L. 109–163, § 605(a)(1), designated existing provisions of subpar. (A) as cl. (i), redesignated former subpar. (B) as cl. (ii) of subpar. (A) and substituted “; or” for period at end, and added a new subpar. (B).
Subsec. (d)(2) to (4). Pub. L. 109–163, § 605(a)(2)–(4), substituted “member under paragraph (1)(A)” for “member under paragraph (1)” in first sentence of par. (2), added par. (3), designated second sentence of par. (2) as (4), and in par. (4) substituted “this subsection” for “this paragraph”.
1999—Subsec. (d). Pub. L. 106–65, § 662, added subsec. (d).
Section and amendment by Pub. L. 106–65 effective 180 days after Oct. 30, 2000, unless postponed, see section 663 of Pub. L. 106–65, as amended, set out as a note under section 8440e of Title 5, Government Organization and Employees.
Pub. L. 109–163, div. A, title VI, § 606, Jan. 6, 2006, 119 Stat. 3287, as amended by Pub. L. 109–364, div. A, title VI, § 608, title X, § 1071(e)(3), Oct. 17, 2006, 120 Stat. 2247, 2401, provided for a pilot program on contributions to the Thrift Savings Plan for initial enlistees in the Army to be carried out between Jan. 6, 2006, and Dec. 31, 2008.

References: § 605
 § 605
 § 605
 § 662
 § 606
 § 608
 § 1071