The name of the fictional Central American country was "San Miguel". The name is Spanish, and translates as "Saint Michael". San Miguel is the real name of numerous towns and cities around the world, but not a country.
The quote from the Bible, said by Ray Kasternak (Gregory Hines), came from Romans 7.19-20. It said: "For I do not do the good that I want. But the evil I do not want is what I do. Now if I do what I do not want, it is no longer I that do it, but sin which dwells within me."
Some scenes, involving helicopters and explosives, were shot at Indian Dunes Motorcycle Park in Valencia, California. This was the same location where, the year before, scenes involving a helicopter and explosions were being filmed for John Landis' segment for Twilight Zone: The Movie (1983). In that instance, tragedy struck, when the helicopter, hovering amidst explosions, had its tail rotor destroyed by the heat from the explosions, causing the chopper to spin out of control, and was sent spinning into a shallow river below, and killing Vic Morrow and two small children, who were attempting to cross the river at the time. The helicopter's main rotor struck the three, killing them instantly.