A U.S. military policeman stands in front of Air Force fighter jets that were part of a NATO show of strength in Romania in April intended to deter Russian intervention in Ukraine. Andreea Alexandru/AP hide caption
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Robert Gates
Robert Gates, president of the Boy Scouts of America, warned that failure to make changes quickly could spell "the end of us as a national movement." Thierry Roge/Reuters /Landov hide caption
Senate Majority Leader Harry Reid of Nevada talks about unemployment benefits during a news conference Thursday. Susan Walsh/AP hide caption
Gen. Martin E. Dempsey, Chairman of Joint Chiefs of Staff, in November of 2013. Paul J. Richards/AFP/Getty Images hide caption
Robert Gates in June 2011 during his final official news conference as secretary of defense. Jason Reed/Reuters/Landov hide caption
Robert Gates on the emotions he felt when writing condolence letters
Robert Gates in June 2011, his last month as secretary of defense. Alex Brandon/AP hide caption
Robert Gates waves and President Obama claps at the then-defense secretary's farewell ceremony in June 2011. Jason Reed/Reuters /Landov hide caption
Former Defense Secretary Robert Gates writes in his new memoir that Hillary Clinton "is a superb representative of the United States all over the world." Charles Dharapak/AP hide caption
In his new memoir, Defense Secretary Robert Gates is unsparing in his criticism of Congress. Jacquelyn Martin/AP hide caption
An artist's rendering of German philosopher Immanuel Kant. Hulton Archive/Getty Images hide caption
Ari Shapiro on 'Morning Edition'
Gen. David Petraeus. Sang Tan/AP hide caption