(a) Unless eligibility for annuity terminates under 5 U.S.C. 8344,a,but,is.

(b) A phased retiree described in paragraph (a) whose entitlement to a composite retirement annuity terminates under 5 U.S.C. 8344 due to reemployment, is an employee effective upon reemployment. The individual is not entitled to a phased retirement annuity (i.e., phased retirement annuity does not resume) during the period of employment, and the individual's entitlement to a composite retirement annuity terminates effective on the date of employment.