Sufficient evidence
Sufficient evidence of basic pay for service exists when the employee, Member, or survivor eligible to make a deposit for service provides copies of all official military pay documents, as identified in instructions published by OPM, which show the exact basic pay he or she received for a full period of service. If an employee, Member, or survivor does not have sufficient evidence of basic pay, he or she shall obtain a statement of estimated earnings from the appropriate branch of the military service.