NOT HELL IN THEPACIFIC the Japanese and Americans try to save casualties by dropping one man off each to fight for an island. Cat and mouse ensues a boatload of soldiers trying to cheat is killed booby traps and at the end both die I think the American last. Japanese offers him choice of surrender 'gallery I give you 60 seconds' I was about 9 when I saw it

Not a complete match, but maybe The Challenge?

Quinn F you are a legend. My brother and I have been looking for years perhaps not helped by it being a TV pilot movie it seems. Many thanks

Glad to help.