This book is a great resource for GMs wishing to run adventures in the Golden Age, or even later. Aside from the pre-generated characters (a mixture of obvious homages and interesting original elements) there is also a unique mechanic to cover invasions that start as small incursions to full invasion status. Further, three invading groups are given-aliens; alternate future half-alien Nazis; and Microverse soldiers.
There are also little nods to the somewhat conflicting of Golden Age stories-the quippy, optimistic stories of superheroes along with grittier war tales, so threats range from over-the-top giant amoeba and cunning, subtle alien infiltration. Easily modified to operate in any other era, The BETA Men make a useful resource for GMs wanting a government agency dealing with the paranormal that heroes can either work with, recieve aid from, or even oppose.