His name is Greg Thomas. I don't know his rank, but I believe he is in the Army.
This picture came a Facebook group I’m on, from
“Flaunt the Flag” day—he sent it to the group set of photos from that day where people showed how they ‘flaunted the flag’ on May 12th.. I thought I’d written down his name, but I can’t find it. I’ll have to go back and look.