Sens. John McCain, R-Ariz., (left) and Jack Reed, D-R.I., hear testimony on operations against ISIS from Gen. Lloyd Austin. Pablo Martinez Monsivais/AP hide caption

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Joint Chiefs Chairman Gen. Martin Dempsey speaks during the graduation ceremony at the U.S. Military Academy at West Point, N.Y., on May 23. In an interview with NPR, he says he's not surprised by the slow going against the Islamic State, predicting it will be a "long campaign." Mike Groll/AP hide caption

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Defense Secretary Ash Carter testifies on Capitol Hill in Washington earlier this month. In an interview on CNN Sunday, Carter complained that Iraqi forces lacked "the will to fight" the self-declared Islamic State. Manuel Balce Ceneta/AP hide caption

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Members of the anti-war activist group CodePink interrupt a Senate Armed Services Committee hearing with Defense Secretary Chuck Hagel (left) and Gen. Martin Dempsey, chairman of the Joint Chiefs of Staff. J. Scott Applewhite/AP hide caption

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Joint Chiefs Chairman Gen. Martin Dempsey speaks during a news conference at the Pentagon in December. Manuel Balce Ceneta/AP hide caption

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Gen. Martin Dempsey, chairman of the Joint Chiefs of Staff, talking to U.S. military personnel in Tokyo last April. Kyodo/Landov hide caption

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Gen. Martin E. Dempsey, Chairman of Joint Chiefs of Staff, in November of 2013. Paul J. Richards /AFP/Getty Images hide caption

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Chairman of the Joint Chiefs of Staff Gen. Martin Dempsey, Secretary of State John Kerry, and Defense Secretary Chuck Hagel testify before the Senate Foreign Relations Committee on Tuesday. Mark Wilson/Getty Images hide caption

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The Two-Way

Syria Debate In Congress: 4 Exchanges You Should Listen To

During a hearing before the Senate Foreign Relations Committee, the Obama administration began making its case for a military strike on Syria.

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Chairman of the Joint Chiefs of Staff Gen. Martin Dempsey. Win McNamee/Getty Images hide caption

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Aug. 13: At Dover Air Force Base in Delaware, the remains of Marine Lance Cpl. Gregory T. Buckley are carried during a dignified transfer. He was killed in a "green on blue" attack. Mark Wilson/Getty Images hide caption

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