Extreme Prejudice (1987)

Lean, mean Texas Ranger Jack Benteen locks horns with a former friend, Cash Bailey, now a ruthless drug kingpin. Though they're on opposite sides of the law, they share a love interest in the sensual Sarita. When a crew of rogue soldiers descends upon the border town for an off-the-books mission, all roads lead to a bloody, to-the-death showdown, as loyalties shift and the lines between good and evil are blurred.