WASHINGTON, DC – JANUARY 16: Former US Secretary of Defense Robert Gates signs copies of his new book, “Duty” during an event sponsored by Politico at the Mayflower Renaissance Hotel on January 16, 2014 in Washington, DC. The book, according to the Washington Post’s Bob Woodward, “unleashes harsh judgments about President Obama’s leadership and his commitment to the Afghanistan war.” Chip Somodevilla/Getty Images/AFP== FOR NEWSPAPERS, INTERNET, TELCOS & TELEVISION USE ONLY ==