Prince of Mercenaries by Jerry Pournelle
Paperback. Condition: Good. 1994. Baen.
Book #1 in the Falkenberg Legion series.
For a century the Americans and Soviets had maintained an uneasy alliance based on a new world order. But the CoDominium is decaying, and the future belongs to colony worlds like Sparta--if they can survive Earth's death-throes. To do that they will need men who understand war, men like mercenary commander John Christian Falkenberg, and Lysander, Prince of Sparta--the first Prince of Mercenaries.