Dear Editors, When Cindy Sheehan lost her son Casey to an unnecessary war, she turned grief into action to help prevent other needless deaths – a truly noble cause [“Sheehan's Field of Dreams,” News, Aug. 19]. We have Megan's Law and the Amber Alert to protect our children. I propose a Casey Doctrine, requiring a national vote and a mandatory draft before U.S. troops can be ordered into combat. This law might help ensure that our young men and women are never sent to kill and be killed unless we are directly threatened and all nonmilitary options have been exhausted. Casey Sheehan was willing to die to defend America, but he died for a pack of lies. Invading Iraq may turn out to be the worst foreign policy tragedy in our history. We must do everything possible to see that such a nightmarish blunder is never committed again. We owe it to Casey.