Ninja Destroyer(1986)

"In the borderlands of a wartorn country, a highly lucrative emerald mine becomes the object of unending dispute. Two Ninjas, Byron and Michael were the best of friends while they fought side by side in the Green Berets. However, in the years that have separated them, they have both become the leaders of rival gangs. Now the two face each other in a final battle of brilliant Ninja combat for control of the mine." - VHS Back of the box description. Hong Kong cut and paste edit of the 1983 Thai Film "มรกตดำ" (Black Emerald) with new ninja scenes.