War_Conflict

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Shirley Sotloff and her husband Arthur B. Sotloff exit a car as they return home after the memorial service for their son, slain journalist Steven Sotloff, at Temple Beth Ann, Friday, Sept. 5, 2014, in Pinecrest, Fla. The Islamic State has beheaded two American journalists it held captive for what the militants called payback for more than 120 U.S. airstrikes on its assets in northern Iraq since Aug. 8. Journalists James Foley and Sotloff were two of what the State Department has described as "a few" Americans still being held hostage by the group. (AP Photo/The Miami Herald, Carl Juste)

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Alexander Zakharchenko, the leader of pro-Russian rebels in Donetsk, meets with the media after talks on cease-fire in Ukraine in Minsk, Belarus, Friday, Sept. 5, 2014. Ukraine and the Russian-backed rebels have signed a cease-fire deal that starts in less than two hours, a European official at the talks said Friday. (AP Photo)

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President Barack Obama speaks at a news conference at the NATO summit at Celtic Manor, Newport, Wales, Friday, Sept. 5, 2014. (AP Photo/Charles Dharapak)

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President Barack Obama speaks at a news conference at the NATO summit at Celtic Manor, Newport, Wales, Friday, Sept. 5, 2014. (AP Photo/Charles Dharapak)

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U.S. President Barack Obama, right, points as he stands alongside British Prime Minister David Cameron, center, and NATO Secretary General Anders Fogh Rasmussen during a flypast at the NATO summit at the Celtic Manor Resort in Newport, Wales on Friday, Sept. 5, 2014. (AP Photo/Jon Super) ** FILE **

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alliance: U.S. President Barack Obama and Ukraine President Petro Poroshenko at the NATO summit at Celtic Manor in Newport, Wales, where they and other world leaders discussed Russian aggression. (Associated Press)

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Both President Obama and British Prime Minister David Cameron (right) have stepped up their rhetoric on the Islamic State group this week, and are hoping to rally international support for defeating the terrorist organization while attending the NATO summit. (Associated Press)

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Soldiers from the People's Liberation Army (PLA) 6th Armored Division carry the Chinese type 97 semiautomatic machine guns at their military base on the outskirts of Beijing. (AP Photo/Andy Wong) ** FILE **

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U.S. President Barack Obama, center, waves as he arrives for a group photo during a NATO summit at the Celtic Manor Resort in Newport, Wales on Thursday, Sept. 4, 2014. In a two-day meeting leaders will discuss, among other issues, the situation in Ukraine and Afghanistan. (AP Photo/Jon Super)

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British Prime Minister David Cameron looks out from a top balcony at the Lodge as he waits for a television interview on the sidelines of a NATO summit at the Celtic Manor Resort in Newport, Wales on Thursday, Sept. 4, 2014. In a two-day summit leaders will discuss, among other issues, the situation in Ukraine and Afghanistan. (AP Photo/Virginia Mayo)

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SMILE: Body-mounted cameras, like ones used by other U.S. police forces, are coming to District. (Associated Press)

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An AH-64 Apache attack helicopter. (Associated Press)

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Houston Texans defensive end J.J. Watt, center, celebrates his sack with teammates Jadeveon Clowney (90) and Jerrell Powe (95) during the first half of an NFL preseason football game against the Arizona Cardinals, Saturday, Aug. 9, 2014, in Glendale, Ariz. (AP Photo/Matt York)

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Intelligence agencies reported that a group of 22 Yemeni-Americans were training in Houston to be seamen on oil tankers, raising terrorism concerns over the unusual activity. (Associated Press)

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President Obama spoke in Estonia about the need for NATO to defend its member states, many of whom are wary of Russian incursions similar to what has occurred in the Ukrainian theater. (Associated Press)

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A statue of Confederate Gen. Thomas "Stonewall" Jackson stands at Manassas National Battlefield Park at Manassas, Virginia. The park offers three hiking trails of varying lengths, a ranger-led walking tour and a network of roads that allows for self-guided driving tours. (File, Associated Press)

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A view of Burnside Bridge and Antietam Creek at Antietam National Battlefield in Sharpsburg, Maryland. Among the superstitious, Antietam is considered to be the most haunted of the Civil War battlegrounds.

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Union soldiers built the Henry Hill Monument in Manassas, Virginia, to commemorate those who died during the First Battle of Bull Run. The monument was dedicated on June 13, 1865.

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Manassas National Battlefield Park also houses a visitor center and two historic structures, including the Brawner Farm Interpretive Center, an accurate replica of the farmhouse originally on the battlefield. Historians, neighbors and Fairfax County officials are protesting a Prince William County plan to build data centers on privately held Civil War battle sites next to the Manassas National Battlefield Park.

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** FILE ** Paratroopers from The 173rd Airborne Brigade Combat Team prepared for and executed a test of its contingency response abilities here Nov. 21, 2013 at Aviano Air Base, Italy. (U.S. Army)