Significance of James George Frazer's book "The Golden Bough"?
Here's my take on the film. It's a bit long, and maybe a bit pretentious, but oh well. Kurtz couldn't handle that truth (the horror) he had found in Vietnam, about both the war and himself (and all of us). Kurtz understood intellectually in his mind what he believed had to be done to win in Vietnam, but his soul couldn't accept it morally, and so went mad. That's what the photographer (Dennis Hopper) meant when he said: "Kurtz's mind is sane but his soul is mad." Then, Coppola uses the book "The Golden Bough" by Sir James George Frazer to explore the difference between Kurtz and Willard. This book is on Kurtz's desk when he is killed by Willard. Frazer's thesis was that "old religions were fertility cults that revolved around the worship and periodic sacrifice of a sacred king. Frazier proposed that mankind progresses from magic through religious belief to scientific thought". Coppola symbolizes the ritualistic death of the "king" (Kurtz) by inter-cutting with the ritualistic slaying of the calf, which echoes this idea by Frazer,
During the assassination, Willard arises from the water in the famous scene as if he is being metaphorically reborn from the primordial ooze, while The Doors "The End" plays on the soundtrack. The song makes reference to the myth of Oedipus (the son killing his father and sleeping with his mother), which has similarities to Frazer's myth of the sacrifice of the sacred king. Willard slays the mad "king" and metaphorically becomes the king himself. He drops his machete to the ground, and Kurtz's followers drop theirs, allowing him to leave the compound unharmed. This may echo the Biblical passage about beating swords into plowshares (if you want a somewhat more optimistic reading of the film), or, you could interpret it as Willard "winning the Heart of Darkness" and becoming the next Kurtz. Willard has faced the horror, survived, and stayed sane, unlike Kurtz who loses both his life and his reason, and unlike Lance, who survives but loses his reason.
On his way out of the compound on the PT boat, "Almighty" (the code word for Airforce HQ) asks him either for the coordinates of the compound or for confirmation to bomb the compound. I think this is left deliberately ambiguous in the film whether Chef had time to transmit the coordinates before being killed, if I recall correctly. In any case, instead of answering, Willard instead turns off the radio without responding. If you think of "Almighty" as God, then Willard is taking Kurtz's advice to kill but not to judge. He doesn't judge Kurtz or his followers, rather he leaves it up to "Almighty" to judge or to punish which is quite appropriate since the title of the film makes reference to the Apocalypse and Judgement Day. The song "The End" heard at the beginning and end also echoes the concept of the Apocalypse. In the original cut of the film (which I greatly prefer), we see the destruction of the compound over the credits. It is ambiguous whether this is the compound actually being bombed, or if it is meant to be symbolic of the concept of Apocalypse and Judgement, something happen "outside the time" of the film, just as the Apocalypse is referred to as the "End of Time". The question of whether such a God capable of (or willing to) judge or create order actually exists ("Who's the CO here?") is also left open to the viewer. When Willard asks the black soldier at the Nung River bridge the question of who is in charge, he merely gets an ambiguous answer: "Yeah."
As Willard leaves the compound in the PT boat, the stone head of the Khmer king from the ruined temple is superimposed next to his face on the screen. In the beginning of the film, we also see the stone head, but Willard's head is upside down. At the end his face and the King's face are both right-side up. Willard has faced and survived the horror and the darkness inside himself, maintained his sanity, and attains a higher level of understanding. So, Willard isn't a good man at the beginning of the film, and still isn't a good man at the end of the film, either. In the course of completing his mission many people are killed to get him to Kurtz. Willard himself kills the Vietnamese girl in the sampan because he doesn't want to lose time by taking her to a medic. The camouflage on Willard's face when he kills Kurtz makes him very like Kurtz in outward appearance, but is there an inner difference? I don't know. We can say for certain that Willard doesn't take Kurtz's place as the leader of the cult, so that's certainly a mark in his favor.
(CONTINUED...)