Differences between the movie and the book

Apocalypse Now and Heart of Darkness have many similiarities, but also drastic differences. The main difference is that the movie takes place in Vietnam whereas the book is centered in the Congo. This ultimately create a larger difference than it appears ut would. In Heart of Darkness the purpose of the location is because it shows why the white men were there. There was a lust for the wealth that the ivory inthe Congo could give them. In the movie there is no explicitly stated purpose for them being in Vietnam. It leaves the viewer wondering why they white men are there. Without a purpose there is little reason for the drive and motivation of Mr. Kurtz and it takes away a layer of complexity.