"It's worth noting, though, that many of the authors' critical portraits rely on private conversations and anonymous sources. The most damning informants in these books are never identified and so can't be questioned."
So what else is new? Liberal "journalists" have always relied on techniques like that to protect themselves from being exposed as liars.
While it's not a history of the Iraq War, I do have a lot of analysis of it, and Afghanistan, in "America's Victories: Why the U.S. Wins Wars and Will Win the War on Terror."