The original “Super Troopers” was a low budget indie from a comedy troupe with something to prove, and they proved it. The “Super Troopers” themselves returned 17 years later, in a sequel whose opening scene was so breathlessly funny it somehow carried the whole, otherwise forgettable film. “Super Troopers 3” sometimes remembers, like all these movies eventually do, that it’s supposed to be a cop film. If all you want is to see these lovable goofballs again you’d be better served watching the first two “Super Troopers” movies and reliving their good old days. If the Super Troopers really want to stay in touch, in another ten years they can write us a postcard.