"LIFE Visits the Planet Atzor
Nebraska Students War & Intrigue in Imaginary World of Their Own"
Article and photos begin on p.102 if that link doesn't quite work.
I also notice the reference to SF/Fantasy author and war historian Fletcher Pratt's naval war game.
From the ads, you will also learn the benefits of drinking yeast in tomato juice. It will give you more ginger than ever before.