This August 23, 2011 photograph obtained courtesy of the Defense Video & Imagery Distribution System (DVIDS) shows Staff Sgt. Robert Bales (right) at the National Training Center in Fort Irwin, California. (Note at 10:50 p.m. ET: Earlier, we mistakenly said he was on the left.) Spc. Ryan Hallock /AFP/Getty Images hide caption

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Spc. Ryan Hallock /AFP/Getty Images

Army Staff Sgt. Robert Bales during an August 2011 training exercise at Fort Irwin, Calif. Spc. Ryan Hallock/AFP/Getty Images hide caption

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Spc. Ryan Hallock/AFP/Getty Images

Afghan villagers prayed last week at a ceremony for the 16 victims of what officials say was an attack by a U.S. Army soldier. Allauddin Khan/AP hide caption

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Allauddin Khan/AP

Quil Lawrence, on 'Morning Edition'

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Bales joined the military after Sept. 11, 2001. He served three times in Iraq before being deployed to Afghanistan. Courtesy Maj. Brent Clemmer hide caption

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Courtesy Maj. Brent Clemmer