War_Conflict

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** FILE ** The USS George H.W. Bush aircraft carrier was commissioned on January 10, 2009. (U.S. Navy)

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The Nimitz-class aircraft carrier USS Abraham Lincoln (CVN 72) transits the Pacific Ocean, March 2, 2011. (U.S. Navy)

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FILE - In this Wednesday, Jan. 1, 2014 file photo, displaced people who fled the recent fighting between government and rebel forces in Bor by boat across the White Nile, prepare to sleep in the open at night in the town of Awerial, South Sudan. South Sudan's government and rebels fighting against it have signed Thursday, Jan. 23, 2014 a cessation of hostilities agreement in Addis Ababa that should at the least put a pause to five weeks of warfare that has claimed thousands of lives and uprooted a half million people since fighting began Dec. 15 between the government and supporters of former Vice President Riek Machar. (AP Photo/Ben Curtis, File)

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Nhail Deng Nhail, 2nd left, the head of South Sudan's negotiating team, and top negotiator for the rebel's side, Taban Deng Gai, right, a general in South Sudan's army before he defected, sign a cessation of hostilities agreement in front of mediator Ethiopian Foreign Minister Tedros Adhanom, center, in Addis Ababa, Ethiopia Thursday, Jan. 23, 2014. South Sudan's government and rebels fighting against it have signed Thursday a cessation of hostilities agreement in Addis Ababa that should at the least put a pause to five weeks of warfare that has claimed thousands of lives and uprooted a half million people since fighting began Dec. 15 between the government and supporters of former Vice President Riek Machar. (AP Photo/Elias Asmare)