About 50 protesters were arrested at the National Air and Space Museum in Washington after they unfurled banners to protestthe opening of an exhibit featuring the Enola Gay, the B-29 that dropped the atomic bomb on Hiroshima 50 years ago and brought World War II to an end. Eight people unfurled banners from the second floor balcony above the main entrance to the museum, some shouting, "Never again! Never again!" They also threw pamphlets down at people entering the museum. Smithsonian Secretary Michael Heyman revised the exhibit -- which originally included graphic depictions of the damage and deaths caused by the bomb -- five times to satisfy congressional critics and outraged veterans' groups. Today, he said: "This is the Enola Gay. It dropped the bomb that ended the war . It doesn't take a position on the morality of it."