Vengeance Army

Hank Frost, the wise-cracking, one-eyed mercenary captain, suddenly becomes commanding general of an anti-Communist Mercenary Army doubling as admiral of a moth-balled invasion fleet. And there's also a $100,000 payoff in the bargain.
All Frost has to do is invade Monte Azul, a country lost to Communist terrorists, and oust Castro's murderous puppet dictator, who's backed by a Castro Army of 4,000 shock troops.
But if he survives that, there's Marina, the daughter of the dead anti-Communist president, who wants Frost as her lover-and the vengeance-bent right-wing Army leader who wants Frost dead. Assassination, piracy commando raids and pitched battles lead Frost ever near the final one-on-one death-duel with the dictator!