First appearance of The Lone Gunmen.
The inspiration for the Lone Gunmen came from a group of men that writers Glen Morgan and Marilyn Osborn met at a UFO convention in June 1993.
The casting of Tom Braidwood as Frohike was absolutely casual, being he is an assistant director. When they were looking for Frohike, nobody found the perfect one. Somebody told something like "we need someone repulsive and with the appearance of Braidwood", so, he was cast.
Early in the story, Mulder tells Scully about places where he's experienced multiple sightings of UFOs. One that he mentions is Okoboji Falls, which Scully would have known about because she was with him there in Conduit (1993).
The name Mulder uses to infiltrate the military base is Tom Braidwood. Tom Braidwood is the name of the actor who plays Melvin Frohike and is also a First Assistant Director on the series. The cover name given to Scully is Val Stefoff, which is a variation on Val Stefoff - another First Assistant Director.