While I have seen fighters use LNS prefix, I generally don't approve, as it is supposed to be for caps. Plus, nobody in their right mind names their ship with LNS unless they really have to. It scream lolwut.
1. LNS is for "Liberty Naval Ship", this prefix is used for gunboats and higher. Some people use that prefix for fighters/bombers, but that seems strange to me.
2. Most message boards require you to be a member of a certain player faction, but Liberty Forces Message Dump seems to be open to all lawfuls (including indies) - http://discoverygc.com/forums/showthread.php?tid=2219