Rachel Rogers, a single mother of four in upstate New York, did not worry about the presence of National Guard recruiters at her son's high school until she learned that they taught students how to throw hand grenades, using baseballs as stand-ins. For the last month she has been insisting that administrators limit recruiters' access to children. Meanwhile, Amy Hagopian, co-chairwoman of the Parent-Teacher-Student Association at Garfield High School in Seattle, has been fighting against a four-year-old federal law that requires public schools to give military recruiters the same access to students as college recruiters get, or lose federal funding....