Crew complement: 120

Weapons: 1 plasma cannon, 6 missile launchers with 30+ "Mambo" or "Misfit" long-range attack missiles, 10+ "Moolah" short-range defensive missiless

Velocity: wf 2.5, cruise; wf 3.1, supercruise; wf 3.2, maximum

Also known as "squids" or "Veronus" by UESN Intelligence, Oscar class destroyers replaced the large hemispherical hull of Akulas with a gently tapered cylindrical hull 30 m in diameter. A small wing atop the hull was tipped with two spindles that may have been auxiliary directional warp nacelles for increased maneuverability at warp speeds. A smaller version of the standard Romulan fusion power plant appeared to be used, but slightly slimmer warp nacelles were capable of propelling Oscar to a maximum observed speed of wf 3.2. Armament included a plasma cannon and six missile launchers.

Oscar-class destroyers, usually in groups of three, were stationed in the predicted pathways of UESN attacks. They attempted to approach within approximately 8 au (1.2 billion km) of their targets, usually Yorktown carriers, and launch their missiles before the carriers' own Minotaur fighters had been launched. Since Yorktowns were often escorted by Powhatan cruisers, one Oscar usually attempted to engage the Powhatan while the others attacked the carrier. Oscar’s normally carried "Mambo" or "Misfit" antiship missiles (as many as 30 were observed to be fired from a single Oscar cruiser) with an estimated range of 12 au (1.8 billion km) and a 100-kt fusion warhead.

If, on the other hand, a Oscar cruiser were able to close within 5 million km of its target without itself being destroyed, the plasma cannon could be used. With a direct hit this devastating weapon could destroy any UESN ship, but was completely unguided and incapable of supraluminal speeds. However, neither could it be spoofed or otherwise stopped without a direct hit with a defensive fusion-tipped missile or impact with a suitably large object. Since the plasma bolt took some 17 seconds to reach targets at extreme range, the most effective tactic was for Yorktown carriers to be ambushed while in normal space, most likely when launching or recovering fighters and, therefore, unable to maneuver.