Cuando hierve la sangre (1959)

Captain Tom Reynolds and his band of skilled OSS operatives are in WWII Burma to arm and train the Kachin natives. But jungle combat, particularly against a Japanese army as familiar with the terrain as the Kachin, is hazardous. Some respite is found during leaves in the arms of beautiful gold digger Carla, but after Chinese raiders cross the border to loot and murder American soldiers, Reynolds abandons all notions of "military protocol" and seeks requital.