George H. W. Bush

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A X47-B Navy drone touches down as it lands aboard the nuclear aircraft carrier USS George H. W. Bush off the Coast of Virginia Wednesday, July 10, 2013. It is the first landing by a drone on a Navy carrier. (AP Photo/Steve Helber)

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Former Presidents George H. W. Bush and Bill Clinton smile on the podium after receiving their honorary degrees at Tulane University Commencement in New Orleans on Saturday May 13, 2006. (AP Photo/Alex Brandon, Pool)

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Former President George H. W. Bush talks to the media during an impromptu visit of the Brady Press Briefing room at the White House, Saturday, Jan. 22, 2005 in Washington. (AP Photo/Lawrence Jackson)

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Former President George H. W. Bush applauds during the evening session of the first day of the Republican National Convention Monday, Aug. 30, 2004, in New York. (AP Photo/Charlie Riedel)

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President George H W Bush is joined by family members as he concedes to Bill Clinton on Nov. 3, 1992 at Houston hotel in Houston. (AP Photo/Ron Edmonds)

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U.S. President George H. Bush sits with Secretary of State James Baker, left, at the Round Table as the summit talks begin with the other leaders of the G-7 countries in Munich, Germany, Tuesday, July 7, 1992. (AP Photo/Scott Applewhite)

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Vice President George H. W. Bush, second from left, with his wife Barbara Bush, looking on at right, addresses supporters during an Over the Top rally, Tuesday, May 4, 1988, Washington, D.C. Bush, who clinched the Republican presidential nomination last week, waited until Tuesday to celebrate his success and wins in uncontested Indiana, Ohio and the District of Columbia primary races. Bush's son, George W. Bush is second from right. The man on the left is unidentified. (AP Photo/Charles Tasnadi)

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President George H. Bush is greeted by his dog Ranger at the White House on Sunday night, Jan. 4, 1993, in Washington after returning from a 19,000-mile journey abroad. (AP Photo/ Wilfredo Lee)