Former Defense Secretary Jim Mattis' new book comes out on July 16, but it won't be a "tell-all" about President Trump, the AP reports.

Details: Random House says "Call Sign Chaos: Learning to Lead" will primarily be about Mattis' military career, including accounts from Afghanistan and Iraq. The book will also "touch upon events over the past couple of years," according to a Random House spokesperson who spoke to the AP.

“My purpose in writing this book is to convey some of the lessons I learned in 43 years of service for those who might benefit, whether in the military or in civilian life. I’m old-fashioned: I don’t write about sitting Presidents, so those looking for a tell-all will be disappointed. I want to pass on the lessons and experiences that prepared me for challenges I could not anticipate, not take up the hot political rhetoric of our day.”

— Mattis' statement on the book release

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