As for Military vs. Passive and Diplomatic vs. Uninvolved, I think that Military generally falls more authoritarian and Passive falls more libertarian, while Diplomatic falls more left-wing and Uninvolved falls more right-wing. So that would mean Activists generally fall closer to top left from their position from being either a Liberal, Libertarian, Conservative, or Statist and how strong their stance is on that, Interventionists generally fall closer to the top right, Isolationists generally fall closer to the bottom right, and Internationalists generally fall closer to the bottom left.
I think this theory lines up rather nicely, since I scored in the center of the bottom left quadrant on Political Compass and I am DHIP (Internationalist Liberal), while you scored higher up, closer to the center of authoritarian and libertarian scale than I did. And the only letter difference between you and I was that you are Militaristic while I am Passive.
I hope I made sense.