When President Bush vetoed the war spending bill, he used Bob Derga's pen. "It was just a plain old black rollerball," Derga said. "Just a $2 pen." But it was priceless to Derga, an Ohio engineer who used it to write letters to his son in Iraq. Cpl. Dustin A. Derga, a reservist with Lima Company, 3rd Battalion, 25th Marines, was killed in a May 2005 assault just east of the Syrian border. For a grieving father, the pen remained a link to what he considers a young life lost for a good cause, and he wanted Bush to use...