<human>: Can you give me a shortened version of the text?

So at this bar I frequent, a rather tall and lanky fellow claims to be a US Marine. Coming from a bit of a military family, I was naturally excited to talk to the guy. I asked him what his unit was and he simply brushed the question aside and exclaimed he was at Fallujah and in Afghanistan as though I attacked his credibility. Gave rise to a little suspicion but whatever. Later, I find this guy is telling the bartender he is US Navy Special Forces. Now this is greatly upsetting to me that this man is possibly impersonating US Armed Forces personnel (to an extent) and I want to know how I can test his authenticity within a respectable manner. Any suggestions?
<bot>: Guy is claiming to be US Marine and I'm not really sure if he is. How do I politely inquire about authenticity?