Mexico City -- Fernando Suarez del Solar feels a sense of urgency about the war in Iraq -- and not just because he lost his only son there two years ago. It is his duty, he says, to warn young Latinos about the perils of joining the U.S. military and becoming, like his son, a "green card Marine," lured by promises of a college education, post-service career and fast-track citizenship. Three years ago, President Bush offered accelerated citizenship to any green card holder who has served in the military since Sept. 11, 2001. Instead, the bereaved father tells would-be recruits,...