The Immortal D7 cruiser, which became an
of Klingon military power in the second half of the 23rd century,
was rushed into service in
the early 2250s to fulfil roles of offense, defense, and diplomacy.
The design was a scaled up version of the D-1 cruiser of almost 100
years earlier. These early D7s suffered many teething problems, but
the ship developed into the Klingons' most reliable cruiser design, which formed the basis for
descendant classes serving into the late 24th century.
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