CLASS               CALL SIGN       SERVICE
-------------------+---------------+--------------
Nebula              NCC-72016       1992 TO 1997
Sovereign           NCC-74997       1997 TO 2009
Luna                NCC-82016       2009 TO 2016
Constitution        NCC-1945        2016 TO 2023
Constitution-III    NCC-982024      2023 TO PRESENT DAY