The reservist differential has no effect on the computation of the military deposit. Military deposit calculations will be determined using military deposit rules prescribed by law. Upon return to civilian service following military duty, employees should apply to make a military service credit deposit through their human resources/benefits office using the designated deposit form (Standard Form 2803 (SF) for CSRS and SF 3108 for FERS). See forms at
https://www.opm.gov/forms/html/sf.asp. To avoid interest accrual, military service credit deposits should be completed as soon as possible. NOTE: Special deposit rules are applicable to employees absent under the Uniformed Services Employment and Reemployment Rights Act of 1994 (USERRA). Employees should ask their human resources office to help determine if their absences were under USERRA and to help estimate their military deposits.