This, on its own, is not unusual. It's possible that even with the added qualifiers making him unique, it's not going to be all that interesting to 90% of nexusgoers. Let's go through said qualifiers:
He's pushing six foot (not quite, and that half inch really kills him, not that he'd admit it), mid forties. Well built and fit for his age, which you can really tell because his jacket isn't zipped and his tshirt has been torn open. There's a handprint shaped scar over his relatively sparsely haired chest -- in between the scar tissue forming the handprint, there's a bullet wound scar, as well, over his heart. It looks recent. He's wearing a uniform that could be military, with his Atlantis expedition patch on one shoulder and the United States flag on the other. He seems to be unarmed.
He also seems to be really fucking confused. 'Where am I' doesn't begin to cover it, so he skips that one.
"Life ever given you a second chance you didn't know what to do with?"