Subject to subsection (b), Federal credit union membership shall consist of the incorporators and such other persons and incorporated and unincorporated organizations, to the extent permitted by rules and regulations prescribed by the Board, as may be elected to membership and as such shall each, subscribe to at least one share of its stock and pay the initial installment thereon and a uniform entrance fee if required by the board of directors. Shares may be issued in joint tenancy with right of survivorship with any persons designated by the credit union member, but no joint tenant shall be permitted to vote, obtain loans, or hold office, unless he is within the field of membership and is a qualified member.
Except as provided in paragraph (2), only a group with fewer than 3,000 members shall be eligible to be included in the field of membership category of a credit union described in subsection (b)(2).
The Board shall issue guidelines or regulations, after notice and opportunity for comment, setting forth the criteria that the Board will apply in determining under this subsection whether or not an additional group may be included within the field of membership category of an existing credit union described in subsection (b)(2).
No individual shall be eligible for membership in a credit union on the basis of the relationship of the individual to another person who is eligible for membership in the credit union, unless the individual is a member of the immediate family or household (as those terms are defined by the Board, by regulation) of the other person.
Except as provided in section 1764 of this title, once a person becomes a member of a credit union in accordance with this subchapter, that person or organization may remain a member of that credit union until the person or organization chooses to withdraw from the membership of the credit union.