Section 49-1509 - Membership of teachers(1) There are hereby created two (2) classes of members in the Tennessee teachers' retirement system, to be known as class A members and class B members and to be defined as follows:(a) Class A members shall be those members who are covered by the provisions of Title II of the Federal Social Security Act and who contribute hereunder for benefits supplementary to the social security benefits. It shall consist of: (i) all teachers who were members prior to the date coverage under the Social Security Act is extended to such class A members, and who prior to June 30, 1959 file on a form approved by the board of trustees, a waiver of their rights to benefits accrued to them under this chapter as it heretofore existed, an election to be covered by said Social Security Act and the supplementary benefits provided by this chapter, as amended, and an agreement to the deduction of their accrued taxes, if any, under the Federal Insurance Contributions Act for the period from January 1, 1956, from the accumulated contributions held in his account in the members' contribution account; and (ii) all teachers who were eligible to elect to become class A members and to be covered under the Social Security Act as provided in (i) above but did not so elect, and who, if a future amendment of the Federal Social Security Act should so permit, elect to become class A members and to be covered under the Social Security Act in accordance with the terms of an agreement, if any, made between the state of Tennessee and the social security administration; and (iii) all teachers who enter the membership on or after the date coverage under the Social Security Act is extended to such class A members.(b) Except as provided in clause (iii) of paragraph (a) of this subsection, class B members shall consist of those members who have not elected to become class A members.(2) Except as provided under § 49-1510, any person who was a teacher on February 15, 1945 or who may have become a teacher on or before July 1, 1945, became a member of the retirement system unless he notified the board of trustees in writing on a form provided by the board on or before July 1, 1946, that he did not choose to become a member of this retirement system, and executed a waiver of all present and prospective benefits which would otherwise accrue to him by participating in the system. Any teacher who elected not to become a member may thereafter apply for and be admitted to membership, but without credit for service rendered after July 1, 1945, and prior to the time he becomes a member, except as provided in §§ 49-1518, 49-1542 and 49-1552.Acts 1945, ch. 29, § 3; 1949, ch. 33, § 1; C. Supp. 1950, § 2540.3 (Williams, § 2824.3); modified; Acts 1957, ch. 87, § 2; 1959, ch. 122, § 1; 1961, ch. 62, § 2; 1965, ch. 170, § 3; 1967, ch. 251, § 2.