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Posted: 5/14/2013 3:59:05 AM EST
In this image provided by the U.S. Navy an X-47B Unmanned Combat Air System demonstrator is loaded onto the flight deck of the aircraft carrier USS George H.W. Bush on Monday May 6, 2013 in Norfolk, Va. The George H.W. Bush is scheduled to be the first aircraft carrier to catapult launch an unmanned aircraft from its flight deck on Tuesday May 14, 2013. (AP Photo/US Navy, Seaman Joshua P. Card)
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Posted: 5/14/2013 3:59:05 AM EST
In this image provided by the U.S. Navy an X-47B Unmanned Combat Air System demonstrator sits on an aircraft elevator of the aircraft carrier USS George H.W. BushMonday May 6, 2013. The George H.W. Bush is scheduled to be the first aircraft carrier to catapult-launch an unmanned aircraft from its flight deck Tuesday May 14, 2013. (AP Photo/US Navy, Specialist 2nd Class Tony D. Curtis)
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Posted: 5/14/2013 3:59:05 AM EST
In this image provided by the U.S. Navy, Dave Lorenz, a Northrop Grumman deck operator, drives an X-47B Unmanned Combat Air System demonstrator using an arm-mounted controller on the flight deck of the aircraft carrier USS George H.W. Bush Friday May 10, 2013. The George H.W. Bush is scheduled to be the first aircraft carrier to catapult launch an unmanned aircraft from its flight deck Tuesday May 14, 2013. (AP Photo/US Navy, Specialist 2nd Class Timothy Walter)
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Posted: 5/2/2013 12:23:49 PM EST
AP10ThingsToSee - President Barack Obama, left, applauds as former first lady Barbara Bush, second from left, and former president George W. Bush, right, help former president George H.W. Bush stand to acknowledge a standing ovation during the dedication of the George W. Bush Presidential Center, Thursday, April 25, 2013, in Dallas. (AP Photo/David J. Phillip, File)
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Posted: 4/29/2013 2:13:06 PM EST
U.S. President Barack Obama (L) stands alongside (L-R) former presidents George W. Bush, Bill Clinton, George H.W. Bush and Jimmy Carter as they attend the dedication ceremony for the George W. Bush Presidential Center in Dallas, April 25, 2013. REUTERS/Jason Reed
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Posted: 4/25/2013 4:37:48 PM EST
U.S. President Barack Obama (L) stands alongside (L-R) former presidents George W. Bush, Bill Clinton, George H.W. Bush and Jimmy Carter as they attend the dedication ceremony for the George W. Bush Presidential Center in Dallas, April 25, 2013. Obama is in Texas to stand shoulder-to-shoulder with former president George W. Bush in what could serve as a powerful reminder of the ongoing struggle against terrorism, from the Sept. 11 attacks to the Boston Marathon bombings. REUTERS/Jason Reed
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Posted: 4/25/2013 4:37:48 PM EST
Former president George W. Bush (R) talks to U.S. vice captain Scott Verplank (C) next to former president George H.W. Bush during the afternoon four-ball round at the 39th Ryder Cup golf matches at the Medinah Country Club in Medinah, Illinois September 29, 2012. REUTERS/Mike Blake
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Posted: 4/25/2013 4:03:40 PM EST
From left, President Barack Obama, former president George W. Bush, former president William J. Clinton former President George H.W. Bush and former president Jimmy Carter arrive for the dedication of the George W. Bush Presidential Center Thursday, April 25, 2013, in Dallas. (AP Photo/David J. Phillip)
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Posted: 4/25/2013 4:03:40 PM EST
Former president George W. Bush wipes a tear after his speech during the dedication of the George W. Bush Presidential Center Thursday, April 25, 2013, in Dallas. Former president George H.W. Bush is at left. (AP Photo/David J. Phillip)
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Posted: 4/25/2013 12:18:52 PM EST
Former President George W. Bush, center, shares a laugh with his wife, former first lady Laura Bush and father, former President George H.W. Bush during the dedication of the George W. Bush Presidential Center, Thursday, April 25, 2013, in Dallas. (AP Photo/David J. Phillip)
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Posted: 4/25/2013 12:18:52 PM EST
President Barack Obama, and former presidents, from second from left, George W. Bush, Bill Clinton, George H.W. Bush and Jimmy Carter arrive for the dedication of the George W. Bush Presidential Center ,Thursday, April 25, 2013, in Dallas. (AP Photo/The Dallas Morning News, Tom Fox) MANDATORY CREDIT; MAGS OUT; TV OUT; INTERNET USE BY AP MEMBERS ONLY; NO SALES
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Posted: 4/25/2013 11:28:29 AM EST
From left, First Lady Michelle Obama, President Barack Obama former first lady Barbara Bush, President George H.W. Bush and former president George W. Bush put their heads down during the invocationduring the dedication of the George W. Bush Presidential Center Thursday, April 25, 2013, in Dallas. (AP Photo/David J. Phillip)
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Posted: 4/25/2013 11:28:29 AM EST
From left, former first lady Barbara Bush, President George H.W. Bush and former president George W. Bush hold hands during the invocation during the dedication of the George W. Bush Presidential Center Thursday, April 25, 2013, in Dallas. (AP Photo/David J. Phillip)
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Posted: 4/25/2013 2:15:36 AM EST
Former president George W. Bush (R) talks to U.S. vice captain Scott Verplank (C) next to former president George H.W. Bush during the afternoon four-ball round at the 39th Ryder Cup golf matches at the Medinah Country Club in Medinah, Illinois September 29, 2012. REUTERS/Mike Blake
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Posted: 4/3/2013 12:04:18 PM EST
Former U.S. President George H.W. Bush (L-R), then president-elect Barack Obama, then President George W. Bush, former President Bill Clinton and former President Jimmy Carter meet in the Oval Office of the White House in Washington in this January 7, 2009 file photo. REUTERS/Kevin Lamarque/Files
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Posted: 3/30/2013 6:08:36 PM EST
Phil Mickelson visits with former president George H.W. Bush after completing the third round of the Houston Open golf tournament, Saturday, March, 30, 2013, in Humble, Texas. (AP Photo/Patric Schneider)
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Posted: 2/8/2013 2:59:36 PM EST
Former U.S. President George H.W. Bush speaks at the World Leadership Summit in Abu Dhabi, United Arab Emirates in this file photo taken November 21, 2006. REUTERS/Stringer
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Posted: 2/8/2013 2:59:36 PM EST
Former U.S. President George H.W. Bush speaks at the World Leadership Summit in Abu Dhabi, United Arab Emirates in this file photo taken November 21, 2006. REUTERS/Stringer
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Posted: 2/8/2013 2:59:36 PM EST
Former U.S. President George H.W. Bush speaks at the World Leadership Summit in Abu Dhabi, United Arab Emirates in this file photo taken November 21, 2006. REUTERS/Stringer
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Posted: 2/8/2013 9:56:11 AM EST
Former U.S. President George H.W. Bush speaks at the World Leadership Summit in Abu Dhabi, United Arab Emirates in this file photo taken November 21, 2006. REUTERS/Stringer