War_Conflict

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Survivors of the Boston Marathon bombings walk onto the field before the Boston Red Sox's baseball home-opener against the Milwaukee Brewers at Fenway Park in Boston, Friday, April 4, 2014. (AP Photo/Michael Dwyer)

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MBTA police officer Richard Donohue, left, hugs Boston Red Sox's David Ortiz as Boston Marathon bombings survivor Heather Abbott, center, stands nearby before the Red Sox's baseball homer-opener against the Milwaukee Brewers at Fenway Park in Boston, Friday, April 4, 2014. (AP Photo/Michael Dwyer)

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In this Wednesday, April 2, 2014 photo, David Bush, chair of the Friends and Descendants of Johnson Island Civil War Prison, works inside a tent to prepare for "Park Day. " Volunteers will help clean up the Civil War prison site. From 1862 to 1865, more than 10,000 Confederate inmates were held in the Johnson Island Civil War Prison. Some never left: about 250 white stones — a few with the stark engraving "unknown" mark the nearby cemetery where men from Mississippi, Missouri, North Carolina, Tennessee and other southern states found their final resting place. (AP Photo/The Blade, Amy E. Voigt

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This April 2, 2014 photo shows the Confederate Cemetery on Johnson Island, Ohio. From 1862 to 1865, more than 10,000 Confederate inmates were held in the Johnson Island Civil War Prison. Some never left: about 250 white stones — a few with the stark engraving "unknown" mark the nearby cemetery where men from Mississippi, Missouri, North Carolina, Tennessee and other southern states found their final resting place. (AP Photo/The Blade, Amy E. Voigt

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This April 2, 2014 photo shows the Confederate Cemetery on Johnson Island, Ohio. From 1862 to 1865, more than 10,000 Confederate inmates were held in the Johnson Island Civil War Prison. Some never left: about 250 white stones — a few with the stark engraving "unknown" mark the nearby cemetery where men from Mississippi, Missouri, North Carolina, Tennessee and other southern states found their final resting place. (AP Photo/The Blade, Amy E. Voigt)