Part H - Retired Participants Recalled, Reinstated, or Reappointed in Agency or Reemployed in Government

50 USC 2111 - Recall

(a) Authority to recall 
The Director may, with the consent of a retired participant, recall that participant to service in the Agency whenever the Director determines that such recall is in the public interest.
(b) Pay of retired participant while serving 
A retired participant recalled to duty in the Agency under subsection (a) of this section or reinstated or reappointed in accordance with section 2051 (b)1 of this title shall, while so serving, be entitled, in lieu of the retired participants annuity, to the full basic pay of the grade in which the retired participant is serving. During such service, the retired participant shall make contributions to the fund in accordance with section 2021 of this title.
(c) Recomputation of annuity 
When the retired participant reverts to retired status, the annuity of the retired participant shall be redetermined in accordance with section 2031 of this title.
[1] So in original. Probably should be section “2051(c)”.

50 USC 2112 - Reemployment

A participant retired under this subchapter shall not, by reason of that retired status, be barred from employment in Federal Government service in any appointive position for which the participant is qualified.

50 USC 2113 - Reemployment compensation

(a) Deduction from basic pay 
An annuitant who has retired under this subchapter and who is reemployed in the Federal Government service in any appointive position (either on a part-time or full-time basis) shall be entitled to receive the annuity payable under this subchapter, but there shall be deducted from the annuitants basic pay a sum equal to the annuity allocable to the period of actual employment.
(b) Recovery of overpayments 
In the event of an overpayment under this section, the amount of the overpayment shall be recovered by withholding the amount involved from the basic pay payable to such reemployed annuitant or from any other moneys, including the annuitants annuity, payable in accordance with this subchapter.
(c) Deposit in fund 
Sums deducted from the basic pay of a reemployed annuitant under this section shall be deposited in the Treasury of the United States to the credit of the fund.