That's what the excerpt said. Amazing.
If anyone hasn't yet guessed, I don't read much about Vietnam, or .mil history generally.
I suffered through Karnow's book on VN,
Vietnam: A History. ALL politics & Washington issues. It should have been titled:
Vietnam: A Book About a War That Really Doesn't Cover the War, But Only Washington Machinations and Politics and Really Hates On Our S Vietnamese Puppets.
There are several survey books on .mil that are of quality and good reads for the interested layman. JFC Fuller wrote a few, as has John Keegan. I'd save Clausewitz for much later. Heck, I'd save ANY 18th/19th century central European author for much later.
Victor Davis Hanson is good on the Greeks & Romans.
Of course, there are the classics, written by contemporaries like Xenophon & such. I'd save those for later. You'll know of who I write, as the previously mentioned authors will call them out.
Great thing about the older .mil authors, is that you can get their works fro a song from Half PRice Books or abebooks.com.