Centurion-class destroyer

The Centurion-class light destroyer, better known as the Centurion and officially known as DD-3 Upgrade Package Alpha was an attempt by UNSC high command to upgrade their aging fleet of prewar destroyers to (relatively) modern standards, to not only expand the fleets numbers but to also provide a relatively effective reserve formation and to hold over the UNSC forces in the first decade post war while assemblies and orbital shipyards were constructed/retooled for the latest UNSC vessels.
Now while outwardly resembling an enlarged Hyperion-class, the centurion simply borrows its cowling and engine nacelle layout to provide additional resistances to remnant plasma weaponry and to fit, larger, more powerful engines and/or more of them with the average being a total of 6 Reese Mckleeves ship yards JS-2800 Deuterium-Tritium fusion rockets with 4 smaller JS-1200 fusion rockets providing an astounding level of speed and agility, out speeding the majority of modern warships, however this isn't some super secret plan to create a god ship, no, its literally just because AI calculations and the earliest upgrades showed that the destroyer would get destroyed before it could effectively engage the vast majority of Covenant warships and so, their only option was to overclock the reactor and risk killing the crew under the G forces to make the class even viable in the modern theater of war.