This subpart applies to any individual participating in CSRS or FERS who:

(a) Has been appointed or otherwise assigned to one of the cooperative extension services, as defined in 7 U.S.C. 3103(5);

(b) Has entered on approved leave without pay to serve as a full-time officer or employee of an organization composed primarily of employees as defined by 5 U.S.C. 8331(1) and 8401(11); or

(c) Has been assigned, on an approved leave-without-pay basis, from a Federal agency to a state or local government under 5 U.S.C. chapter 33, subchapter VI.