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Col. David W. Maxwell holds a press conference at the Marine Corps Museum in Quantico, Va., on Friday, March 22, 2013, regarding a murder/suicide that occurred on Thursday night that resulted in the deaths of three Marines. A Marine killed a male and female colleague in a shooting at a base in northern Virginia before killing himself, officials said early Friday. (AP Photo/The Free Lance-Star, Peter Cihelka)

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The Marine Base Quantico, spokesman Lt. Agustin Solivan briefs reporters following a shooting incident on the base Friday, March 22, 2013. Three people, including the suspect, were killed in the shooting at Marine Base Quantico, Solivan said early Friday. (AP Photo/Matthew Barakat)

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This image provided by the U.S. Marine Corps shows snow covering one of Marine Corps Base Quantico’s many signs Wednesday, March 6, 2013. Three people, including the suspect, were killed in a shooting at Marine Base Quantico, a base spokesman said early Friday, March 22, 2013. (AP Photo/US Marine Corps, Cpl. Antwaun L. Jefferson)

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Former South Carolina Gov. Mark Sanford votes on Tuesday. He’s on his way to making a political comeback from the public scorn he faced after it was revealed he engaged in an extramarital affair. (Associated Press)

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Actor Harrison Ford, an avid private pilot, arrives in Santo Domingo, Dominican Republic, for the Operation Smile relief effort for Haitian earthquake victims in 2010. Mr. Ford piloted his Cessna 208 Caravan to the Dominican capital for the airlift of medical volunteers and supplies into Hinche, Haiti. (AP Photo/Operation Smile)