From the back cover:
Sometime in the late 1990's war began. It was the final World War, and it went on and on, with conventional weapons. Fighting moved to America's shores. Biological weapons were resorted to. They gassed, they poisoned, they polluted. Resources on both sides became depleted, but no one dared drop the bombs.
All the secret weapons were released. Genetically engineered men and monsters, secret robot armies, all the old mouldering World War II gear was used up. The Big Guys could see they just might lose it.
They decided to drop the bombs.
Vehicle combat, skills, hand-to-hand fighting, everything!
Complete role-playing rules
Now it is the year 2101. The average citizen doesn't know as much about history as you just read. He doesn't care about the rest of the world. All he knows is that except for "Sanny Frisco" and a few isolated cities "back east", the "United State" is in the stone age.
All you need are a set of polyhedral dice, paper, pencil, and a ruler!