Raiders of the Magic Ivory.

Two Vietnam vets are hired to infiltrate a religious sect and steal an ancient relic, a magic ivory tablet. Mercenaries Sugar and Mark enter a dangerous jungle full of cannibalistic natives in an unnamed Asian country and retrieve an ancient stone relic being held by a hostile religious sect. The two accept the job but something about the gig just isn't sitting right and their client may be withholding information vital to the mission and their survival.