From Bubba:

Sean Huze enlisted in the Marine Corps right after the Sept. 11 attacks and was, in his own words, "red, white and blue all the way" when he deployed to Iraq 16 months later. Unquestioning in his support of the invasion, he grew irritated when his father, a former National Guardsman, expressed doubts about the war.

Today, all that has changed. Haunted by the civilian casualties he witnessed, Corporal Huze has become one of a small but increasing number of Iraq veterans who have formed or joined groups to oppose the war or to criticize the way it is being fought.
...
A grenade tossed into Robert Acosta's Humvee in Baghdad in July 2003 left him without his right hand and shattered his legs. Mr. Acosta, 21, spent months in hospitals surrounded by other young amputees, watching news about government commissions concluding that Iraq had no unconventional weapons.

He began reading, watching the news and talking to people, especially Vietnam veterans like Mr. Origer in Santa Fe. Last summer, his girlfriend heard Paul Rieckhoff, the founder of Operation Truth, speak on the radio. Mr. Acosta contacted him. By the fall, Mr. Acosta had become the organization's public face, appearing in a provocative television advertisement.

Mr. Acosta, who is attending community college in Southern California, said he hoped to bring friends from his old unit in the First Armored Division into Operation Truth as they leave the Army, because they might start to experience some of the problems he faced. For instance, he said, he once used duct tape to hold his prosthesis together because he could not get it repaired quickly at the local Veterans Affairs hospital. And people often asked about his injury.

"People would just come up to me and say, 'How'd you lose your arm?' " Mr. Acosta said. "And I'd say, 'In the war.' And they would be like, 'What war?' "