One of my local thrift stores near Camp Pendleton had this odd banner of a military-style fighting knife with a lighthouse for a grip. It's a low budget piece, somewhat crudely silk-screened. Whomever had it made marked it TM for "trademark" presumably so that someone else doesn't try to make and sell these?????
My guess would be that it is for some sort of informal organization and I've been trying to think of groups whose emblem could include a lighthouse and Ka-Bar.