There... that's much better.
Considering that the heroes of Flight 93 said the Lord's Prayer together before taking out the Islamists, I'd say the most prominent aspect should (and must) be a crucifix.
If you haven't already seen the National Geographic two part program on 9/11, set your TIVO. It is really, really good. I can't imagine even liberals feeling sorry for Bin Laden after seeing it all put together like this.
I've suggested leaving the crescent, provided it is impaled on the foot of a cross, the way you see it on top of the domes of churches St. Stephan of Moldova built to commemorate his victories over the Turks.
(Of course, if we incorporated an American eagle grasping the crescent in its talons, that would be fine with me, too.)
..but don't hold your breath on the Cross being centerpiece to the memorial.
All those folks are in eternity now.....but the folks living will not honor the Cross & what it meant to those about to die.
Someone is bound to say...'it wouldn't be politically correct'....
...May God help us all.