Ordered as an alternative in case of the failure of the Constitution
Class. The delays to Constitution Class meant that the Pyotr Velilkiy served
as an interim Heavy Cruiser, and was ordered in quantity in response to
Klingon aggression in 2244.
The eventual entry of the Constitution Class to service in large numbers
meant that the Pyotr Velikiy was relegated to less glamorous duties, and
some were converted to serve as tugs. The Cruiser version was phased out by
2312.
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