In determining years of service, an employee is entitled to credit for all service of a type that would be creditable under section
8332, regardless of whether or not the employee is covered by subchapter III of chapter 83, and for all service which is creditable by virtue of subsection (e). However, an employee who is a retired member of a uniformed service as defined by section
3501 of this title is entitled to credit for active military service only if—
(C)
on November 30, 1964, he was employed in a position to which this subchapter applies and thereafter he continued to be so employed without a break in service of more than 30 days.
The determination of years of service may be made on the basis of an affidavit of the employee. Leave provided by this subchapter accrues to an employee who is not paid on the basis of biweekly pay periods on the same basis as it would accrue if the employee were paid on the basis of biweekly pay periods.