I have a question for those more in tune with ship classes - I'm doing a basic re-write of an old game (Hunt for Red October). It doesn't explain the different ship classes (e.g., FF, SSN, etc.) so I thought I'd put a brief description (a sentence or two) in there. I was able to garner quite a bit of info online, but one class I'm not certain of is the FFL. I know that's a Light Frigate, but what is a Light Frigate's mission, in one or two sentences, as opposed to a regular FF?