Four men wearing enlisted service dress blues attended a Las Vegas expo filled with porn stars. And a Utah National Guardsman has the pics to prove it. The picture-taker, a 29-year old specialist who requested his full name not be used and attended the event out of uniform, said he was in the crowd Jan. 19 at the Adult Entertainment Expo at the Hard Rock Hotel & Casino when he noticed the quartet. “There’s something wrong with these pictures,” said the tipster who sent the above image — and other pictures, including some less suitable for publication. “It’s awesome that…