The Cloning Centers need to be destroyed to save everyone that’s trapped there. Most of the Cloning Centers are in Deep Underground Military Bases like Area 51 located in Nevada and Dulce Base located in Dulce, New Mexico for example. These bases have a cloning floor and that cloning floor is called a Cloning Center. Some of the Cloning Centers are ABOVE ground. There is one somewhere (above ground) in Western, Canada.
The picture above is an example of what a Cloning Center looks-like.
Locations of Cloning Centers: http://donaldmarshall.proboards.com/thread/36/locations-probable-cloning-centres?page=1