War_Conflict

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A crowd gathers at the finish line of the Boston Marathon in Boston for a Sports Illustrated photo shoot before the one-year anniversary of the Boston Marathon bombings, Saturday, April 12, 2014. (AP Photo/Michael Dwyer)

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A crowd gathers at the finish line of the Boston Marathon in Boston for a Sports Illustrated photo shoot to commemorate the one-year anniversary of the Boston Marathon bombings, Saturday, April 12, 2014. (AP Photo/Michael Dwyer)

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Boston Marathon bombing survivor Marc Fucarile, seated, talks to his son Gavin, 6, at the finish line of the Boston Marathon in Boston, Saturday, April 12, 2014. At least 2000 people, including survivors and first-responders showed up to participate in a Sports Illustrated photo shoot to commemorate the one-year anniversary of the bombings. (AP Photo/Michael Dwyer)

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Boston Mayor Marty Walsh, center, poses with first-responders, survivors and at least 2000 other people at the finish line of the Boston Marathon in Boston, Saturday, April 12, 2014. The crowd gathered for a Sports Illustrated photo shoot to commemorate the one-year anniversary of the Boston Marathon bombing. (AP Photo/Michael Dwyer)

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FILE - In this April 15, 2013 file photo, emergency workers aid an injured woman on Boylston Street, at the site where a bomb exploded during the 2013 Boston Marathon in front of the Marathon Sports store in Boston. Shattered glass lies on the sidewalk in the background. In the course of a year, limbs have been replaced, psyches soothed, the wounds sustained in a moment at the marathon’s finish line have at least begun to heal. At the same time, a city shaken by an act of terrorism has returned to its usual rhythms - sadder, but some say stronger, as well. (AP Photo/Charles Krupa, File)

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This March 2013 photo provided by Nicole Lynch shows her brother, Sean Collier, during a trip to Newfoundland, Canada. Collier, a Massachusetts Institute of Technology police officer, was shot to death, allegedly by the two suspects in the Boston Marathon bombings on April 19, 2013. (AP Photo/Nicole Lynch)

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FILE - In this April 15, 2013 file photo, blood covers the sidewalk on Boylston Street, at the site where a bomb exploded during the 2013 Boston Marathon in front of the Marathon Sports store in Boston. At right foreground is a folding chair with the design of an American flag on the cover. In the course of a year, limbs have been replaced, psyches soothed, the wounds sustained in a moment at the marathon’s finish line have at least begun to heal. At the same time, a city shaken by an act of terrorism has returned to its usual rhythms - sadder, but some say stronger, as well. (AP Photo/Charles Krupa, File)

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In this March 25, 2014 photo, Boston Marathon bombing survivor Marc Fucarile walks from his home in Reading, Mass. Fucarile lost his right leg in an explosion April 15, 2013, near the finish line of the race. (AP Photo/Steven Senne)

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FILE - In this April 15, 2013 file photo, medical workers aid injured people near the finish line of the 2013 Boston Marathon following two bomb explosions in Boston. In the course of a year, limbs have been replaced, psyches soothed, the wounds sustained in a moment at the marathon’s finish line have at least begun to heal. At the same time, a city shaken by an act of terrorism has returned to its usual rhythms - sadder, but some say stronger, as well. (AP Photo/Charles Krupa, File)

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In this Tuesday, March 18, 2014 photo, Boston Marathon bombing survivor Roseann Sdoia walks with her boyfriend, Boston firefighter Mike Materia, after her doctor's appointment in Newton, Mass. Materia, who came to her aid after being severely injured in the bombing, is credited with helping to save Sdoia's life. (AP Photo/Charles Krupa)

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In this Tuesday, March 11, 2014 photo, Boston Marathon bombing survivor Roseann Sdoia drives back to her apartment in the North End neighborhood of Boston, following a therapy and training session. At home, she must climb the almost 20 stairs of the old building in the historic Boston neighborhood. (AP Photo/Charles Krupa)