FORT HUACHUCA, AZ — Military intelligence analysts train for years — honing their skills, plotting over maps, and studying reference sources. But one analyst of the 309th Military Intelligence Battalion has recently blended his real-world military training with his fascination of the HBO series "Game of Thrones."

While it may seem surreal, it was nothing short of epic for Specialist Andrew Rigbe.

He and his three-man working group had studied the night before, even locking themselves in the common room, poring over thousands of pages by flashlight.

"This is exactly what we're trained for," exhorted Rigbe, following his strategic briefing for a potential invasion of Westeros.

Westeros is already politically unstable. It had recently suffered a civil war and now faced possible invasion, assisted by traitors from within its trusted small council. The only trouble with this briefing was obvious to everyone but Rigbe: Westeros isn't real.

It's a land spawned from the imagination of George R.R. …