I used to have the first manga of Golgo 13 (or what was rerelased here in the US, which had random chapters in the 300 or so) and it wasnt bad, it is definetly an anime for the older crowd.
And theres a NES game ported to the US, which i see copies of it from time to time. I have yet to see the movies or OVA, though i do want to look into them.
Golgo can be described as a much more darker City Hunter, or if Ryu didnt have a comedic charactor. Golgo is also thought to be different races and cultures, from japanese, russian, english, middle eastern and many more, from different profiles and assumed alises he uses in his work.
Wow, its been a good while since ive posted something on the anime forum that i really like to talk more about. If any Golgo was to air on Ani Monday, its probably going to be the 80's movie...