To be fair, the organizational theme of the pictures is "photographs that changed the world". He does include a case for why each of the pictures changed the world in some particular way. I can't say I understand or agree with the entire collection, but it is very nice nonetheless. I don't think the Iwo Jima shot really meets the criteria, despite the fact that it is a great picture. I happen to like the Chinese "tank man". But in what way did it change the world? I think the biggest omission is the picture of the Earth. That one had a profound influence on the ecology movement and really did "change the world."