You have several SCDs. For example, your SCD Leave appears on every SF 50 (Notification of Personnel Action) in Block 31. Its service that is creditable for leave accrual purposes, such as advancing to the next leave category. Your SCD Retirement reflects service that is creditable toward your eligibility to retire. Generally, SCD Leave and SCD Retirement are the same unless you are retired military. If you are a military retiree, consult with your human resource (HR) office to determine your SCD Retirement. Your estimate will use the assumption that you will make a deposit to receive credit for any military service. If you are not retired military, use the SCD from Block 31 on a recent SF 50.