One veteran commented that it seemed that the different commanders and services within the US armed forces were more at conflict with each other than with the Japanese

MacArthur and Patton were both massive egomaniacs, weren't they? I guess well-adjusted people don't end up as wartime generals.

But the Japanese army and navy hated each other so much that some Admirals and Generals were walking around with bullets in them from unsuccessful assassination attempts from the other service. Not a great way to run a war.