I've run into a few characters over the years whose war stories seemed like fantasy or fragments of movie scenes to me. OK, grain of salt and all.
I was watching recent military parade videos on YT and the "Phony Navy SEAL of the Week" channel popped up on the side bar. These phony SEALs have books about their fake adventures, march in parades, are pastors, are sometimes featured on TV news stories, are often martial artists, and are big deals down at the legion or VFW. Some have never even served in the military at all. It's funny because they can never remember their class numbers or fellow veteran's names, and don't seem to know that not a single SEAL has ever been taken as a POW. Of course, their records (even the most basic) are sealed or were burned in a fire. Not True
I'm guessing it starts with the normal military BS stories. They like the attention, and it just gets away from them. Eventually they run into someone who knows better than they do and calls them out.