Gladius-class heavy corvette (EXverse)

The Gladius-class heavy corvette is a lightly armed and agile warship in service with UNSC Navy. Developed around the start of the war, it was commissioned three years later as a patrol vessel capable of engaged every pirate ship; outgunned, as obviously, by every Covenant ship, during the war Gladius were assigned to Inner Colony worlds in anti-piracy and patrol operations, often giving alert of imminent Covenant invasions.
Having fought a dozen of minor battles, only twenty-four were lost in the war, thus surviving it and continuing service in the troublesome post-war years, where piracy is a major problem.