"Code" "Explanation" "From" "Through" "=""N""" "No. Never covered. Employee has never been covered by the CSRS or FERS." "01/01/1970" "Present" "=""Y""" "Yes. Previously covered. Employee has previously been covered by the Civil Service Retirement System (CSRS) or Federal Employees' Retirement System (FERS). An employee would be considered as having previously been covered regardless of whether contributions were made to the CSRS or the FERS, or whether or not they withdrew previously contributed funds." "01/01/1970" "Present"