Trashman's got his own classification system that probably doesn't relate to most people's works or any reference from :V:. I'd think that the most logical system is to establish a naming convention, which :V: did seemingly on the basis of size alone, and stick with that. If the GTVA is introducing a new Frigate class into the mix, then new alien ships similar to this new class would be designated "Frigates". The Moloch has a fighterbay, but it is a corvette; if the GTVA built a light strike carrier with the size of a corvette, somewhat undergunned, and a fighterbay, then the Moloch would probably be reclassified as a Strike Carrier. The GTVA, aside from the Colossus, has nothing larger than a Destroyer, so when a systematic class of vessels appears that falls well above the criteria for destroyers they are labeled Juggernauts, a non-technical, non-milatary term meaning essentially "really powerful." If the Colossus was standardized as, say, a Dreadnaut class, then the Sathanas would probably be reclassed a Dreadnaut. Truth be told, no one knows enough about the Shivans to give a quantative analysis to their categorization of ship types, so the ones used by the GTVA are applied. Now the introduction of classes into the classification scheme should be kept to a minimum I think, but if you're going to add one or two into the fleet you're fighting for, then by all means feel free to do so. Just don't expect other people to use your classifications outside of your project.