Who are they, the Vietnam War veterans who have become such powerful, contested symbols on this election's battlefield? Perhaps they are the vets in the documentary Stolen Honor -- aging former POWs in medal-bedecked suits, the unbowed and angry men who say that John Kerry's anti-war activism lengthened their time in torture cells in Vietnam and tarnished their honor as American soldiers at home. Or maybe the ones in George Butler's Going Upriver, the latest Vietnam documentary qua Kerry campaign biography -- young men in crumpled fatigues, screaming, weeping, and crumpling to the ground after they hurl their medals in protest over a war they believed was, as Kerry testified to the Senate Foreign Relations Committee in 1971, “the biggest nothing in history.”