Niels Tietze leads a group of veterans of the wars in Afghanistan and Iraq up the Snake Dike route on the western wall of Yosemite National Park's Half Dome. David P. Gilkey/NPR hide caption

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Mourners carry the coffin of a car bomb victim during the funeral in the Shiite holy city of Najaf, Iraq, last week. Violence is on the rise in Iraq, but it is receiving little international attention. AP hide caption

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Subway passengers affected by the sarin gas attack on Tokyo's subway system are carried into St. Luke's International Hospital in Tokyo on March 20, 1995. Thirteen people were killed and more than 6,000 injured in the attack, which was carried out by the Aum Shinrikyo cult. Chikumo Chiaki/AP hide caption

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Then-Iraqi dictator Saddam Hussein (at right) behind an artillery piece during the Iraq-Iran war. (An undated photo from the 1980s.) Reuters/Landov hide caption

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Marine Cpl. Paul Wayman, left, and former Navy SEAL Nathanael Roberti met through a program in California that helps veterans readjust to civilian life. StoryCorps hide caption

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Iraqis walk past a wall that a car bomb destroyed, next to the Ahl al-Bayya' mosque in southeastern Baghdad Monday. At least 10 bombings were reported in the city today. Ali Al-Saadi /AFP/Getty Images hide caption

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The Long Walk, Brian Castner's memoir of PTSD and a difficult homecoming, will soon be an opera. YouTube hide caption

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Scot Paltrow is a special enterprise correspondent for Reuters. Reuters hide caption

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