The Mercenary

From the back cover Pocket Book paperback February 1977:

**Why Has John Christian Falkenberg Thrown Millions of People on Dozens of Planets into Turmoil?**

Because he's given up the brilliant military career he's known since age fifteen to fight on his own.

Because he's a legend to the Earth-bound, a mastermind to his soldiers, an enigma to the politicians who buy his services.

But mostly because he's John Christian Falkenberg.