This was one of a number of economy-sized war movies filmed in the Philippines in the early 60's recreating the war in the Pacific twenty years earlier with the help of authentic locations and generous helpings of wartime stock footage. You've seen it all before, but in the hands of a young Monte Hellman and cameraman Mars Rasca it looks remarkably good, has an anachronistic but atmospheric jazz score by Mike Velarde - and of course it has Jack Nicholson, who plays the unit member who speaks Japanese, in which we hear him at one point questioning a captured Japanese soldier.