Amazon.com Product Description (ISBN 0879978430, Paperback)

Blackcollars: Allen Caine had never met any of those superbly trained guerilla warriors, but their explots in the war against the alien Ryqril invaders were legendary. Chemically augmented with drugs to prolong youth, double speed and reflexes, and enhance memory, they were a special task force trained in hand-to-hand combat against an enemy far more powerful and swift than human soldiers. An ultimate weapon more insidious that the giant Nova-class battle cruisers, the Blackcollars had been the deadliest men in the history of Earth warfare..