Being a fan of all things pulp, I know that the pulp didn't completely die out after WWII. Through the 1960s, there were a bunch of "men's adventure" pulps featuring manly men fighting Communists, Nazis, large snakes, etc, and eating steaks, and smoking cigars.
I'd like to do a one-shot along those lines, with a bunch of old-school CIA tough guys headed down to Brazil to raid a hidden castle deep in the jungle and take out some escaped Nazi war criminals. Maybe set the thing around 1960ish, so they can all be grizzled WII vets and so there's a hint of that Cold War espionage craze which was right around the corner. And a scoop of Jonny Quest.
I'm talking Charles Bronson, Lee Marvin, Robert Mitchum kinda guys.