USS Czar'ak (NCC-1798) was a Constitution-class heavy cruiser — of the Achernar-subclass — on active duty in Starfleet during at least the 23rd and early 24th centuries. (Ships of the Star Fleet, vol. 1)

Czar'ak was deployed to the Starfleet Sixth Fleet from 2284 to sometime in the 2290s.

Czar'ak was either refit to an Enterprise (II)-subclass standard — or replaced by a new-build Enterprise (II) subclass heavy cruiser that was given the registry NCC-1798-A. In any case, Czar'ak-A was also deployed to the Sixth Fleet through at least early 2308. (Starfleet International: Vessel Registry, 0801.07 revision)

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