I recently worked with a guy like that...
bragged he was in the SEALS for 12 years.
"it's more fun to hunt people because they can shoot back"
"I spent 2 months in central Africa with the ????? tribe. they gave us all their food for 2 weeks because we were SEALS."
He was 31 years old.
do the math

If you heard the constant every day telling someone new "I was a Special Forces OP for 12 years..." When the actual Vietnam Vet Marine Corporal in our warehouse started talking mumbo-jumbo just to call his bluff this guy went "yup, yup, I fired that in Afghanistan"
I started acting I forgot how old he was, then whenever I heard him give the 12 years line I'd make up a reason to ask him in the next few minutes "how old are you again?"
sad thing is he is as out of shape as I am for cripes sake, he'd claim "I worked out at the hotel for 3 hours last night."
all that floats by my mind is Chris Farley in Tommy Boy asking the chick by the pool "you know where the weight room is?"
