If you read enough biography and history, you learn how people have dealt successfully or unsuccessfully with similar situations or patterns in the past. It doesn't give you a template of answers, but it does help you refine the questions you have to ask yourself.
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About James Mattis
James Mattis was a contemporary American military officer. James Norman Mattis is an American military officer who served as the 26th United States secretary of defense from 2017 to 2019. A retired Marine Corps four-star general, he commanded forces in the Gulf War, the War in Afghanistan, and the Iraq War. Read more on Wikipedia →