According to Guy-with-a-Gun's own folder titled Secrets About Me:
He spent five years in Vietnam (1979-1985), after the war. His family was killed by a bootleg VHS copy of "The Punisher" exploding in his VCR. He started his own war on crime with pals, Guy-with-Claws and Ghost Guy.
As Frank Curtis, he works at Infantino City's Daily Beaver Newspaper as a reporter. He is often assigned Peter Schwartz (The Amazing Walrus-Boy) as his photographer.