Stock Photo - United States President Barack Obama, center, speaks during a meeting with U.S. Secretary of Defense Ashton Carter , right, and U.S. Vice President Joe Biden, left, in the Oval Office of the White House in Washington, D.C., U.S., on Tuesday, Feb. 17, 2015. Carter, sworn in as defense secretary today, inherits an array of defense and foreign policy challenges that are likely to help define the remaining two years of Obama's presidency. Credit: Andrew Harrer / Pool via CNP. - Washington/District of Columbia/Vereinigte Staaten

Stock Photo: United States President Barack Obama, center, speaks during a meeting with U.S. Secretary of Defense Ashton Carter , right, and U.S.

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