Rob Jones and Oksana Masters will compete in adaptive rowing at the London Olympics this week. Jones is a former U.S. Marine who lost both legs to an improvised land mine in southern Afghanistan. David Gilkey/NPR hide caption

itoggle caption David Gilkey/NPR

Homeless veterans, their families and volunteers stand in line for food at "Stand Down," an annual event hosted by the Veterans Village of San Diego. The VA estimates that about 67,000 vets are homeless. David Gilkey/NPR hide caption

itoggle caption David Gilkey/NPR

A U.S. soldier watches members of the Afghan Public Protection Force arrive at the transition ceremony on the outskirts of the Afghan capital Kabul on March 15. The APPF replaces all private security contractors in the country. Ahmad Jamshid/AP hide caption

itoggle caption Ahmad Jamshid/AP

The Afghan government wants Muslim preachers to tone down sermons that often criticize the presence of American troops and praise the Taliban. Here, an Afghan youth drags his sheep past a group of men praying at a mosque in Kabul in November 2011. Muhammed Muheisen/AP hide caption

itoggle caption Muhammed Muheisen/AP

Manullah Ahmadzai, 27, lost the sight in his right eye while serving as a front-line soldier in the Afghan military. Ahmadzai is one of many soldiers who have been severely injured and say promised government benefits don't always arrive. David Gilkey/NPR hide caption

itoggle caption David Gilkey/NPR

Afghan women pass U.S. soldiers near Bagram Air Base outside Kabul in 2010. While conditions for Afghan women have improved over the past decade, but they still face many restrictions, as well as abuses like honor killings. Joel Saget/AFP/Getty Images hide caption

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Afghan miners in a makeshift emerald mine in the Panjshir Valley in 2010. Reports suggest that Afghanistan is sitting on significant deposits of oil, gas, copper, iron, gold and coal, as well as a range of precious gems like emeralds and rubies. Currently these minerals are largely untapped and are still being mapped. Majid Saeedi/Getty Images hide caption

itoggle caption Majid Saeedi/Getty Images

Afghans gather outside a military base in the Panjwai district in Afghanistan on March 11, after 16 civilians were killed in a massacre allegedly carried out by a U.S. soldier. Allauddin Khan/AP hide caption

itoggle caption Allauddin Khan/AP

Afghan female police officers are trained by Afghan police and NATO soldiers in eastern Afghanistan's Ghazni province on Sept. 12. In the culturally conservative country, women serving in the security forces say they face systemic sexual coercion and even rape by male colleagues. STR/EPA/Landov hide caption

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Afghan demonstrators burn an effigy of President Obama and shout anti-U.S. slogans in the eastern city of Jalalabad on Wednesday, Feb. 22. Afghans have been rioting for three days after word that several Qurans were desecrated at a NATO base. The U.S. says the burning of the Qurans was accidental. Noorullah Shirzada/AFP/Getty Images hide caption

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Traumatic brain injuries are most often caused by powerful blasts from improvised explosive devices. A roadside bomb explodes, and the concussive effect violently shakes the brain inside the skull. Stefano Rellandini/Reuters /Landov hide caption

itoggle caption Stefano Rellandini/Reuters /Landov

New York Times journalist Anthony Shadid (second from right) reported from Embaba, a neighborhood in Cairo, in February 2011 during the revolution that toppled Egyptian President Hosni Mubarak. Ed Ou/Getty Images hide caption

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Aw Muhammad, a resident of a refugee camp in western Kabul, pulls back a shade as one of his six surviving children looks out on the snow. Afghanistan is suffering one of its harshest winters in many years. Quil Lawrence/NPR hide caption

itoggle caption Quil Lawrence/NPR

Taliban fighters walk with their weapons after joining Afghan government forces during a ceremony in Herat province, last month. Thirty fighters left the Taliban to join government forces in western Afghanistan. The Taliban announced recently that they would open a political office in Qatar ahead of talks with Washington. Aref Karimi/AFP/Getty Images hide caption

itoggle caption Aref Karimi/AFP/Getty Images