Convoy escort

A convoy escort was a smaller warship classification used by human militaries such as the UNSC Navy, planetary defense forces, and some private military contractors.

Characteristics
An offshoot of frigates, convoy escorts are somewhat smaller, more economical craft that can be mass-produced during crises to protect slow-moving civilian craft. They generally occupy the size gap between frigates and corvettes, with an average length of 350 meters (1,150 ft) and a mass of ~750,000 metric tons. Though most are built to the same standards used in civilian vessels, even those that meet all military shipbuilding regulations are still generally more poorly armored than dedicated warships. Indeed, this has contributed to a general reputation of being fragile, barely more protected than the freighters they're guarding.

Convoy escorts are strictly built with a defensive role in mind: they must fight off any merchant raiders that they come in contact with, distracting them long enough to allow the convoy to scatter. Running enemy ships down is out of the question. For this reason, convoy escorts are slow, nowhere near fast enough to keep up with even cruisers. It is also why most have a multi-layered sensor network that, while hardly advanced, is enough to detect most raiders and some outdated prowlers. The advantage of going slow means that they do have substantial range

Though they are designed to relieve frigates and destroyers, they are not intended to stand in for them. The need for low crew numbers has compromised their weapons, which ranged around missiles and plenty of point defense armaments. Even MACs tend to be small, being adapted from those used on corvettes.