Information on Peden Barracks

I'm looking for information on what happened to the memorial rocks that were at Peden Barracks. I'm looking for one in particular: a helicopter went down south of Karlstadt in December of 1978. 4 service members were killed. Two of them were CW3 Edward A Jones (P) and Cpt. Stanley E. Rohner (P). A memorial was created and set into a rock on post. Does anyone know what happened to the memorial?