UFA, RUSSIA - JULY 9: In this handout image supplied by Host Photo Agency / RIA Novosti, President of the Russian Federation Vladimir Putin at a BRICS leaders limited attendance meeting during the BRICS/SCO Summits - Russia 2015 on July 09, 2015 in Ufa, Russia. (Photo by Iliya Pitalev / Host Photo Agency/Ria Novosti via Getty Images)
TO GO WITH AFP STORY BY HARO CHAKMAKJIAN (FILES) -- File picture dated December 8, 2005 shows US Soldiers having lunch at "Burger King" at their military base in southern Baghdad. For a growing number of young US troops in Iraq, boredom is becoming the new enemy as major anti-insurgency raids turn rarer and their disengagement from the country starts to take shape. AFP PHOTO/SAMUEL ARANDA (Photo credit should read SAMUEL ARANDA/AFP/Getty Images)
WASHINGTON, DC - JULY 09: Commandant of the U.S. Marine Corps General Joseph Dunford Jr. arrives for his confirmation hearing before the Senate Armed Services Committee to be the next chairman of the Joint Chiefs of Staff in the Hart Senate Office Building on Capitol Hill July 9, 2015 in Washington, DC. During testimony, Dunford identified Russia as the biggest threat facing the United States and that if budget sequestration was to continue, the U.S. military will face 'catastrophic consequences.' (Photo by Chip Somodevilla/Getty Images)
ARLINGTON, VA - JULY 6: (AFP OUT) U.S. From L, Secretary of Defense Ashton Carter looks on as President Barack Obama delivers remarks after meeting with members of his national security team concerning ISIS at the Pentagon July 6, 2015 in Arlington, Virginia. Obama announced the U.S. military is making progress against the Islamic State in Iraq and Syria. (Photo by Drew Angerer - Pool/Getty Images)
WASHINGTON, DC - JULY 07: U.S. Secretary of Defense Ashton Carter answers questions from committee chairman Sen. John McCain (R-AZ) during a hearing held by the Senate Armed Services Committee July 7, 2015 in Washington, DC. Carter and Joint Chiefs of Staff Chairman Gen. Martin Dempsey (R) testified on the topic of "Counter-ISIL Strategy." (Photo by Win McNamee/Getty Images)
ARLINGTON, VA - JULY 6: (AFP OUT) U.S. President Barack Obama (R) and Secretary of Defense Ashton Carter (C) look on at the start of a meeting with members of the president's national security team concerning ISIS at the Pentagon July 6, 2015 at the Pentagon in Arlington, Virginia. Last month, Obama announced he would send an additional 450 military personnel to aid Iraqi military attempting to retake the Ramadi, which fell to ISIS in May. (Photo by Drew Angerer - Pool/Getty Images)
WASHINGTON, DC - MAY 06: U.S. Secretary of Defense Ashton Carter testifies before the Senate Appropriations Committee on Capitol Hill May 6, 2015 in Washington, DC. The committee heard testimony on the fiscal year 2016 budget for the Department of Defense. (Photo by Win McNamee/Getty Images)