A small garrison of Marines are in a Central American country to train soldiers and help with lawful government. A band of outlaws are roaming the countryside robbing, killing and fermenting revolution. Darrick is in change of the training and he is smitten with American Joan Grant. But two things cause trouble for Darrick. One is the new pilot named Malone who is sent to the camp and the other is his old girl friend name Theresa. When Grants' Plantation is attacked by the outlaws looking for money, she flees to the garrison and the Marines search for the outlaws and their mysterious leader. Meanwhile, Darrick and Malone vie for Joan.