Stationed on a large, often-attacked base in northern Iraq, the Army propagandist traveled all over Iraq on orders to seek uplifting stories about fellow troops. Yet Thompson's experiences only further confirmed his fears.
Among U.S. troops he found low morale, brutal tactics and a dehumanizing distance from the people whose country they occupied. Among Iraqis he found anger, fear and distrust of the American occupation.
His superiors allowed him to write about none of those things.
"We wrote in code," Thompson said. "Like, when we would write, 'This soldier has overcome many obstacles', it meant he pretty much complained about his job during the entire interview."
He returned home on July 24 - Pioneer Day in Utah. The blasts of exploding fireworks left him anxious and jumpy.
In Utah, where polls indicate support for the Iraq war runs higher than in any other state, Thompson found many who wanted to hear the kind of news he had been assigned to find in Iraq.
"I felt so alienated," he said. "What people wanted to hear was not what I was able to tell them."
Before returning home, Thompson and his wife, Kristen, discussed how they could help make the case for a withdrawal of U.S. troops. A few weeks after his return, they decided: From Idaho to Arizona, he would walk across the "reddest" state in the nation. He could do it in a month - roughly a day of walking for every 100 service members killed in the war.
The stunt, as Thompson called it on his Web site - www.soldierspeace.com - had its intended effect: Media attention drove thousands to his site before he had taken a single step.
The journey began early on the morning of Oct. 2. Approaching Logan that afternoon, Thompson braced himself for a spiteful response, akin to what he had tasted during the prewar protest. <Read More.>