POG stands for 'Poor old guy'
Lots of these guys seen walking round Hereford in desert boots, jeans, and their old combat jackets, complete with issue 'tash and greasy hair.
Basically ex-SAS members who live off their pension/ benefits contently in homes, or in council houses (after their wives have left them from having PTSD etc.). They walk very quickly and usually from between the 'military club', and 'queens arms', very quiet and keep themselves to themselves.
Very good characters and conversationalists, and down to earth too. And for all we know, he could have been the Second Man On The Balcony