UNSC destroyer
From Halopedia, the Halo wiki
Description
Destroyers come in two classes, Heracles, such as the Pioneer, and the more modern class, such as the Iroquois and the UNSC Lancelot.
Although the UNSC Destroyer is only seven meters longer than a UNSC Frigate, they are almost double the mass, weighing in at 8,000 tons. Unlike most ships in the fleet, Destroyers carry no single-ship fighters; their large mass comes rather from the two meters of Titanium A armour battle plate covering the ship. Unfortunately, these Destroyers are looked down upon by many in the fleet because they are considered too slow and cumbersome in combat. On the contrary, anyone who served on a Destroyer knew that they could dish out, and take, a tremendous beating. Destroyers like these have fought in many major engagements such as The Battle of Sigma Octanus IV.
