Well, my math says they're going to have bit of trouble to complete it by the 30th anniversary...2021-1991=30.
Going to the DS/DS memorial group page, they are looking to "break ground" in 2021, so the writer got it wrong.
As a DS/DS vet, I'm not a big fan of this memorial and especially the cost of $40M.
Should be a relatively simple affair honoring those who served and most importantly, those who died.
Most times "less is more".