Dunja Mijatović, from Bosnia and Herzegovina, who was the representative on Freedom of the Media for the Organization for Security and Cooperation in Europe from 2010 to 2017, shares what she sees as the greatest security challenge in the world today during a graduation ceremony featuring 93 security professionals from 41 countries who’d taken the Program on Applied Security Studies at the George C. Marshall European Center for Security Studies in Garmisch-Partenkirchen, Germany, Nov. 16, 2017. Marshall Center photo by Army Sgt. Richard Gerszewski