The head of an agency or his or her designee may, at his or her sole discretion, provide credit for service that otherwise would not be creditable under 5 U.S.C. 6303(a) for the purpose of determining the annual leave accrual rate of an individual receiving his or her first appointment (regardless of tenure) as a civilian employee of the Federal Government or an employee who is reappointed following a break in service of at least 90 calendar days after his or her last period of civilian Federal employment. The head of the agency or his or her designee must determine that the skills and experience the employee possesses are—

Essential to the new position and were acquired through performance in a prior position having duties that directly relate to the duties of the position to which he or she is being appointed; and

Necessary to achieve an important agency mission or performance goal.

Notwithstanding 5 U.S.C. 6303(a), the head of an agency or his or her designee may, at his or her sole discretion, provide credit for active duty uniformed service that otherwise would not be creditable under 5 U.S.C. 6303(a) for the purpose of determining the annual leave accrual rate of an employee who is a retired member of a uniformed service as defined by 38 U.S.C. 4303. The head of the agency or his or her designee must determine that the skills and experience the employee possesses are—

Essential to the new position and were acquired through performance in a position in the uniformed services having duties that directly relate to the duties of the position to which he or she is being appointed; and

Necessary to achieve an important agency mission or performance goal.

When the head of an agency or his or her designee makes a determination to provide service credit for prior work experience or active duty in the uniformed services under paragraph (a) or (b) of this section, he or she must determine the amount of service that will be credited. The amount of service credited may not exceed the actual amount of service during which the employee performed duties directly related to the position to which the employee is being appointed.

An employee must provide written documentation, acceptable to the agency, of his or her prior work experience. An employee must provide written documentation from the military, acceptable to the agency, of his or her uniformed service. The head of an agency or his or her designee must make the determination to approve an employee's qualifying prior work experience before the employee enters on duty.

The agency must establish documentation and recordkeeping procedures sufficient to allow reconstruction of each action.

Credit for prior work experience or experience in a uniformed service under paragraphs (a) and (b) of this section is granted to the employee upon the effective date of his or her initial appointment to the agency or reappointment after a 90-day break in service and remains creditable for annual leave accrual purposes thereafter unless the employee fails to complete 1 full year of continuous service with the appointing agency.

If an employee is placed in a leave without pay status during the 1-year period of continuous service required by paragraph (f)(1) of this section, the 1-year period of continuous service must be extended by the amount of time in a leave without pay unless—

The employee separates or is placed in a leave without pay status to perform service in the uniformed services (as defined in 38 U.S.C. 4303 and 5 CFR 353.102) and later returns to civilian service through the exercise of a reemployment right provided by law, Executive order, or regulation; or

The employee separates or is placed in a leave without pay status because of an on-the-job injury with entitlement to injury compensation under 5 U.S.C. chapter 81 and later recovers sufficiently to return to work.

If an employee separates from Federal service or transfers to another agency before completing 1 full year of continuous service with the appointing agency—

Any credit under paragraph (a) or (b) of this section must be subtracted from the employee's total creditable service before the employee transfers or separates, and the agency must establish a new service computation date for leave accrual purposes under 5 U.S.C. 6303(a);

Any annual leave accrued or accumulated by an employee as a result of receiving credit for service under paragraph (a) or (b) of this section remains to the credit of the employee; and

The agency must—

Transfer the annual leave balance to the new employing agency under 5 CFR 630.501 if the employee is transferring to a position to which annual leave may be transferred; or

Make a lump-sum payment under 5 CFR 550.1205 for any unused annual leave if the employee is separating from Federal service or moving to a position to which annual leave cannot be transferred.