Overview: 2012/05/21 Headlines: Dozens Killed in Yemen Suicide Bombing; Veterans Return War Medals as Thousands March on NATO Summit; Chicago Police Accused of Entrapment as Activists Charged in Terror Plots; NATO OKs New Missile Shield Deployment in Europe; Nuclear Atomic Agency Chief Visits Iran Ahead of Baghdad Summit; House Boosts Pentagon Spending, Backs Indefinite Detention; Alabama Governor Enacts Harsher Anti-Immigrant Law; NAACP Votes to Back Same-Sex Marriage; Striking Quebec Students Denounce Emergency Law Curbing Protests;$