When war started in Iraq, a generation of U.S. women became involved as never before -- in a wider-than-ever array of jobs, for long deployments, in a conflict with daily bloodshed. More than 155,000 women have served in Iraq and Afghanistan. Among their ranks are more than 16,000 single mothers, according to the Pentagon, a number that military experts say is unprecedented. How these women have coped and how their children are managing have gone little-noticed as the war stretches across a fourth year. "It has to be one of the hardest things that a mom and her children have to go through," said Steven Mintz, a University of Houston professor with an expertise in family life. "You can't cuddle a young child over the phone, and you can't cuddle a child through e-mail."