820 CIRCUMSTANCES WHERE APPLICABLE
The head of agency may, on request of an employee serving in a foreign area:
a. at an isolated post performing functions required to be maintained on a substantially continuous basis, grant the employee compensatory time off for an amount of time spent equal to that spent in regularly scheduled overtime work; or
b. at a post in a locality that customarily observes irregular hours of work, or where other special conditions are present, in order to cope with such conditions, grant the employee compensatory time off for an amount of time equal to that spent in regularly scheduled overtime work for use during the pay period in which it is earned.
830 PROHIBITIONS
a. Credit for compensatory time off earned under Section 820b shall not form the basis for any additional compensation.
b. Compensatory time off earned under Section 820 a and b shall be for use only while the employee is assigned to the post where it is earned. Such compensatory time not used at the time the employee is reassigned to another post shall be forfeited.
840 GRANTING COMPENSATORY TIME OFF
Compensatory time off as described in this chapter may be granted in accordance with implementing regulations of the responsible Government agency, subject to provisions of this chapter.