Keith Laumer 
The Night of the Trolls 

In 
The Night of the Trolls, science fiction author Keith Laumer introduces us to one of his most popular inventions: the Bolo, a super tank capable of defending or destroying mankind. Jackson, a volunteer in an experiment with suspended animation, awakens to discover 80 years have gone by and the world has fallen apart. With a the help of a Bolo, it is up to him to bring mankind back. Bolo to the Rescue!