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U.S. Assistant to the President for Homeland Security and Counterterrorism John Brennan, nominated by U.S. President Barack Obama to be the next Director of the Central Intelligence Agency, testifies before the Senate Intelligence Committee February 7, 2013 in Washington, DC. (Photo by Alex Wong/Getty Images).
Ashton Carter 25th Secretary of Defense under Barack Obama. Ashton Carter was appointed to the position of Secretary of Defense by President Barack Obama in 2015 and served until 2017.