Hi peeps

Im looking for a name of a particular manga that got my attention a while ago it seemed very interesting. It had a vampire and werewolf as the main characters. The werewolf was a older gentleman and he had guns while the vampire was a younger guy who fought with his hands. I cant remember the story correctly but i do know it was something about a war and the vampire was a hero because he fought in the war.

Thanx guys appreciate your help