Full Disclosure: Sean Connery had a bit part in it, as did Gert Froebel. And just as in Goldfinger, they were on opposite sides. :-)
Ths Longest Day was an excellent movie, seemingly one of the last of the patriotic Hollywood films. The cast reads like a who's who of hollywood.
Who can forget the paratrooper hung on the spire of the small Cathedral at Sainte Mère Église, with a balcony seat over the fierce firefight between the Germans and the 82nd airborne? Must see destination for American tourists, before the church gets torched.