These are one of the only remains of anything on the beaches from those days. I believe they're prefab concrete blocks meant as a base for the temporary docks they built after the beaches were cleared.
All throughout the cemetery, WWII veterans were followed by groups of all ages. Pictures taken, autographs signed, hands shaken, these men were treated like rock stars. (I even overheard one of them saying so.)
In the center of the cemetery is this small, round chapel. Around it are benches where several veterans were sitting, talking to small groups of people, signing autographs, and having their pictures taken.