It's been eight months since President Donald Trump's first secretary of defense, Jim Mattis, handed in his resignation.
Now the retired four-star general has written his first book, co-authored by former Marine Bing West. Spoiler alert: Call Sign Chaos: Learning to Lead is not, as the title might suggest, a tell-all exposé of Mattis' tense tenure at the helm of the Pentagon with Trump as commander in chief.
"I'm old fashioned," Mattis writes. "I don't write about sitting presidents."