...and minus several thousand for thinking things through...
Sitting around the neighborhood gun store, it's easy for people to BS their credentials. Walk into one at any given time and you'll find a couple-three former SEAL Delta Ranger Snipers.
It's a little harder to make outlandish claims on some of the bigger internet forums, since there's a much greater statistical chance that a person who actually was what you claim to have been may wander by.
Check out this incident on the Smith & Wesson forum I stumbled across while Googling info on the Federal .38 Spl 147gr +P+ Hydra Shok load, where a guy claims to have been an FBI agent who was present at the infamous '86 Miami shootout, and then a couple of real FBI types post in the thread.
I wonder how many times this guy spun his yarns about his Special Agent heroics in Miami at his Local Gun Shop without anyone calling him on it?