Light frigates, corvettes, and offshore patrol vessels

How does a light frigate differ from a corvette or an offshore patrol vessel?

In this working distinction, an offshore patrol vessel lacks warfighting equipment, a corvette is a combatant with limited deployment endurance, and a light frigate can undertake longer deployments and wartime duties with support from a task group or nearby land-based forces.

At roughly 4,000 tons standard displacement and 5,500 tons fully loaded, Mogami fits the light-frigate category used here. The classification depends on intended employment as well as size. In this working distinction, an offshore patrol vessel is not equipped for warfighting, while a corvette is a combatant without the same expectation of sustained deployments lasting weeks or months. The light frigate combines combat duties with longer deployments. It is also the smallest combatant intended for wartime task-group service, with larger ships or forces in home waters supplying support. An isolated picket assignment or an independent battle falls outside that definition.