June 3, 2014
From Afghanistan: Dogs of War, one of 40 photos. Ricky, an explosive detector dog, with Canadian soldiers from Task Force 3-09 Battle Group during operation Tazi, a village search and security operation in the Dand area of Kandahar Province, southern Afghanistan, on January 26, 2010. (AP Photo/Kirsty Wigglesworth)

From Afghanistan: Dogs of War, one of 40 photos. Ricky, an explosive detector dog, with Canadian soldiers from Task Force 3-09 Battle Group during operation Tazi, a village search and security operation in the Dand area of Kandahar Province, southern Afghanistan, on January 26, 2010. (AP Photo/Kirsty Wigglesworth)

May 14, 2014
From Syria’s City of Homs, Shattered by War, one of 28 photos. Forces loyal to Syria’s President Bashar al-Assad walk in a street in old Homs city on May 8, 2014. Syrian forces took full control of Homs last week, a city once vibrant with pro-democracy crowds but now associated with images of ruin that epitomize the brutality of Syria’s civil war. After holding the Old City of Homs for nearly two years, close to 1,200 rebel fighters boarded buses which took them out of the “capital of the revolution” in convoys on Wednesday and Thursday, activists said. They were driven to rebel-held territory outside the city under a deal agreed between the insurgents and forces loyal to President Bashar al-Assad. (Reuters/Khaled al-Hariri)

From Syria’s City of Homs, Shattered by War, one of 28 photos. Forces loyal to Syria’s President Bashar al-Assad walk in a street in old Homs city on May 8, 2014. Syrian forces took full control of Homs last week, a city once vibrant with pro-democracy crowds but now associated with images of ruin that epitomize the brutality of Syria’s civil war. After holding the Old City of Homs for nearly two years, close to 1,200 rebel fighters boarded buses which took them out of the “capital of the revolution” in convoys on Wednesday and Thursday, activists said. They were driven to rebel-held territory outside the city under a deal agreed between the insurgents and forces loyal to President Bashar al-Assad. (Reuters/Khaled al-Hariri)

April 30, 2014
From Afghanistan: April 2014, one of 40 photos. Afghan National Army soldiers prepare to participate in a military exercise on the outskirts of Kabul, Afghanistan, on April 30, 2014. The Afghan National Security Forces depend exclusively on billions of dollars in funding from the United States and its allies, money that is now at risk after President Hamid Karzai’s refusal to sign a security agreement to keep a small U.S. force of trainers in the country after the NATO-led coalition ends its mission and withdraws at the end of the year. (AP Photo/Massoud Hossaini)

From Afghanistan: April 2014, one of 40 photos. Afghan National Army soldiers prepare to participate in a military exercise on the outskirts of Kabul, Afghanistan, on April 30, 2014. The Afghan National Security Forces depend exclusively on billions of dollars in funding from the United States and its allies, money that is now at risk after President Hamid Karzai’s refusal to sign a security agreement to keep a small U.S. force of trainers in the country after the NATO-led coalition ends its mission and withdraws at the end of the year. (AP Photo/Massoud Hossaini)

March 19, 2014
From In Syria: Three Years of War, one of 37 photos. This picture taken the United Nations Relief and Works Agency for Palestine Refugees in the Near East (UNRWA) shows residents of the besieged Palestinian camp of Yarmouk, queuing to receive food supplies, in Damascus, Syria, on January 31, 2014. A United Nations official is calling on warring sides in Syria to allow aid workers to resume distribution of food and medicine in a Palestinian district of Damascus. The call comes as U.N. Secretary General Ban Ki-Moon urged Syrian government to authorize more humanitarian staff to work inside the country, devastated by its 3-year-old conflict. (AP Photo/UNRWA)

From In Syria: Three Years of War, one of 37 photos. This picture taken the United Nations Relief and Works Agency for Palestine Refugees in the Near East (UNRWA) shows residents of the besieged Palestinian camp of Yarmouk, queuing to receive food supplies, in Damascus, Syria, on January 31, 2014. A United Nations official is calling on warring sides in Syria to allow aid workers to resume distribution of food and medicine in a Palestinian district of Damascus. The call comes as U.N. Secretary General Ban Ki-Moon urged Syrian government to authorize more humanitarian staff to work inside the country, devastated by its 3-year-old conflict. (AP Photo/UNRWA)

January 6, 2014
From Afghanistan: December 2013, one of 38 photos. An Afghan worker inspects hundreds of shipping containers received by U.S. and NATO troops at a storage yard in Kandahar, southern Afghanistan, on October 28, 2013. These containers are often used to transport tons of scrap bought by Afghans from the departing U.S. military. (AP Photo/Anja Niedringhaus)

From Afghanistan: December 2013, one of 38 photos. An Afghan worker inspects hundreds of shipping containers received by U.S. and NATO troops at a storage yard in Kandahar, southern Afghanistan, on October 28, 2013. These containers are often used to transport tons of scrap bought by Afghans from the departing U.S. military. (AP Photo/Anja Niedringhaus)

December 17, 2013
From Syrian War Worsens Ahead of Peace Conference, one of 38 photos. Residents run from a fire at a gasoline and oil shop in Aleppo’s Bustan Al-Qasr neighborhood, on October 20, 2013. Witnesses said the fire was caused by a bullet fired by a sniper loyal to Syrian President Bashar al-Assad at the Karaj al-Hajez crossing, a passageway separating Aleppo’s Bustan al-Qasr, which is under the rebels’ control and Al-Masharqa neighborhood, an area controlled by the regime. (Reuters/Haleem Al-Halabi)

From Syrian War Worsens Ahead of Peace Conference, one of 38 photos. Residents run from a fire at a gasoline and oil shop in Aleppo’s Bustan Al-Qasr neighborhood, on October 20, 2013. Witnesses said the fire was caused by a bullet fired by a sniper loyal to Syrian President Bashar al-Assad at the Karaj al-Hajez crossing, a passageway separating Aleppo’s Bustan al-Qasr, which is under the rebels’ control and Al-Masharqa neighborhood, an area controlled by the regime. (Reuters/Haleem Al-Halabi)

November 26, 2013
From After Afghanistan: Learning to Walk Again, one of 25 photos. Sgt. Matt Krumwiede of the U.S. Army takes a phone call as his hand is massaged by his mother Pam Krumwiede, after being admitted for an infection at Brooke Army Medical Center in San Antonio, Texas, on November 4, 2013. On June 12, 2012, Krumwiede was on patrol in Afghanistan when he stepped on an IED, which tore away both his legs, damaged his left arm, and ripped open his abdominal cavity. The 22-year-old has since undergone around 40 surgeries and is learning to walk with prosthetic legs. He is keen to re-join the infantry as soon as his injuries allow. (Reuters/Jim Urquhart)

From After Afghanistan: Learning to Walk Again, one of 25 photos. Sgt. Matt Krumwiede of the U.S. Army takes a phone call as his hand is massaged by his mother Pam Krumwiede, after being admitted for an infection at Brooke Army Medical Center in San Antonio, Texas, on November 4, 2013. On June 12, 2012, Krumwiede was on patrol in Afghanistan when he stepped on an IED, which tore away both his legs, damaged his left arm, and ripped open his abdominal cavity. The 22-year-old has since undergone around 40 surgeries and is learning to walk with prosthetic legs. He is keen to re-join the infantry as soon as his injuries allow. (Reuters/Jim Urquhart)

October 3, 2013
From Afghanistan: September 2013, one of 34 photos. Here, a man washes his horse in Kabul, Afghanistan, on August 4, 2013. (Reuters/Mohammad Ismail)

From Afghanistan: September 2013, one of 34 photos. Here, a man washes his horse in Kabul, Afghanistan, on August 4, 2013. (Reuters/Mohammad Ismail)

September 9, 2013
From Six Million Displaced by War in Syria, one of 38 photos. Mohammad B., a refugee from Daraa, Syria, poses for a portrait in Cairo, Egypt, on August 28, 2012. He fled Syria for his life in May 2011, after he was shot in the face and badly wounded in his hometown of Daraa, the birthplace of the uprising against Bashar Assad’s rule. (AP Photo/Maya Alleruzzo)

From Six Million Displaced by War in Syria, one of 38 photos. Mohammad B., a refugee from Daraa, Syria, poses for a portrait in Cairo, Egypt, on August 28, 2012. He fled Syria for his life in May 2011, after he was shot in the face and badly wounded in his hometown of Daraa, the birthplace of the uprising against Bashar Assad’s rule. (AP Photo/Maya Alleruzzo)

September 4, 2013
From The Women of the Afghanistan War, one of 41 photos. British army Corporal Sandra Jordan exercises at Camp Bastion, Britain’s largest base in Helmand Province, Afghanistan, at sundown, on June 3, 2009. Jordan is a ward nurse at the camp hospital, where British and coalition force troops, Afghan National Army and Afghan National Police, as well as civilians and enemy casualties are treated.(AP Photo/Jon Bevan, Ministry of Defence)

From The Women of the Afghanistan War, one of 41 photos. British army Corporal Sandra Jordan exercises at Camp Bastion, Britain’s largest base in Helmand Province, Afghanistan, at sundown, on June 3, 2009. Jordan is a ward nurse at the camp hospital, where British and coalition force troops, Afghan National Army and Afghan National Police, as well as civilians and enemy casualties are treated.(AP Photo/Jon Bevan, Ministry of Defence)

August 12, 2013
From War-torn Syria Split into Three Regions, one of 36 photos. A rebel fighter passes through an access hole broken in the perimeter of a football pitch, close to the front line, where clashes between the rebels and pro-government troops have been taking place on the outskirts of the northern city of Aleppo, on July 4, 2013. (Daniel Leal-Olivas/AFP/Getty Images)

From War-torn Syria Split into Three Regions, one of 36 photos. A rebel fighter passes through an access hole broken in the perimeter of a football pitch, close to the front line, where clashes between the rebels and pro-government troops have been taking place on the outskirts of the northern city of Aleppo, on July 4, 2013. (Daniel Leal-Olivas/AFP/Getty Images)

August 1, 2013
From Afghanistan’s Children of War, one of 44 photos. An Afghan refugee girl, in a mud house built with help from the Norwegian refugee council in Ghorian district of Herat province, Afghanistan, after returning to her home country on May 27, 2008. Many Afghan refugees struggle to rebuild their lives in their shattered homeland after spending years, sometimes decades, in Pakistan and Iran where they fled over the last 30 years of almost continual war. (Reuters/Ahmad Masood)

From Afghanistan’s Children of War, one of 44 photos. An Afghan refugee girl, in a mud house built with help from the Norwegian refugee council in Ghorian district of Herat province, Afghanistan, after returning to her home country on May 27, 2008. Many Afghan refugees struggle to rebuild their lives in their shattered homeland after spending years, sometimes decades, in Pakistan and Iran where they fled over the last 30 years of almost continual war. (Reuters/Ahmad Masood)

July 3, 2013
From The Battle of Gettysburg: 150 Years Ago, one of 33 photos. Here, Confederate Civil War reenactors launch an evening attack during a three-day Battle of Gettysburg re-enactment on June 29, 2013 in Gettysburg, Pennsylvania. Some 8,000 reenactors from the Blue Gray Alliance participated in events marking the 150th anniversary of the July 1-3, 1863 Battle of Gettysburg. Confederate General Robert E. Lee’s Army of Northern Virginia was defeated at Gettysburg, considered the turning point in the American Civil War. (John Moore/Getty Images)

From The Battle of Gettysburg: 150 Years Ago, one of 33 photos. Here, Confederate Civil War reenactors launch an evening attack during a three-day Battle of Gettysburg re-enactment on June 29, 2013 in Gettysburg, Pennsylvania. Some 8,000 reenactors from the Blue Gray Alliance participated in events marking the 150th anniversary of the July 1-3, 1863 Battle of Gettysburg. Confederate General Robert E. Lee’s Army of Northern Virginia was defeated at Gettysburg, considered the turning point in the American Civil War. (John Moore/Getty Images)

June 3, 2013
From Afghanistan: May 2013, one of 38 photos. An Afghan National Army soldier assigned to the Mobile Strike Force Kandak fires an RPG-7 rocket-propelled grenade launcher during a live-fire exercise supervised by the Marines with the Mobile Strike Force Advisor Team on Camp Shorabak, Helmand province, Afghanistan, on May 20, 2013. (USMC/Staff Sgt. Ezekiel R. Kitandwe)

From Afghanistan: May 2013, one of 38 photos. An Afghan National Army soldier assigned to the Mobile Strike Force Kandak fires an RPG-7 rocket-propelled grenade launcher during a live-fire exercise supervised by the Marines with the Mobile Strike Force Advisor Team on Camp Shorabak, Helmand province, Afghanistan, on May 20, 2013. (USMC/Staff Sgt. Ezekiel R. Kitandwe)

May 29, 2013
From Syria’s Long, Destructive Civil War, one of 37 photos. A Syrian boy holds an AK-47 assault rifle in the majority-Kurdish Sheikh Maqsud district of the northern Syrian city of Aleppo, on April 14, 2013. In northern Syria, the Kurdish population has largely observed a careful compromise with regime and rebel forces, fighting alongside neither, in return for security and semi-autonomy over majority Kurdish areas, but there have been reports of Kurdish fighters joining the battle with Syrian rebels in certain areas, including in Sheikh Maqsud. (Dimitar Dilkoff/AFP/Getty Images)

From Syria’s Long, Destructive Civil War, one of 37 photos. A Syrian boy holds an AK-47 assault rifle in the majority-Kurdish Sheikh Maqsud district of the northern Syrian city of Aleppo, on April 14, 2013. In northern Syria, the Kurdish population has largely observed a careful compromise with regime and rebel forces, fighting alongside neither, in return for security and semi-autonomy over majority Kurdish areas, but there have been reports of Kurdish fighters joining the battle with Syrian rebels in certain areas, including in Sheikh Maqsud. (Dimitar Dilkoff/AFP/Getty Images)