It's G.I. Joe, it was (up until RoC) an american unit with a couple of foreign service observers (Big Ben, Skymate, Backstop, Switch Gears and Long Range #2). Skymate's an awesome character if you look past the outfit (and with the Joes of that era, you have to).
How is he a joke? He's part of the SAS which makes him one of the toughest Joes (SAS > Rangers) and his card says he's one of the toughest Australian SAS soldiers.