Says who? The state of Pennsylvania's logo is a keystone, Its called the keystone state.  This is just one of the many many links we found to the word/symbol of the keystone.  If you go tothe CIA's home page they say they are the Keystone of the intelligence community.  But kill Pennsylvania or the CIA and the DS survives and jsut rebuilds.  We are looking for what one thing you can pull that brings the whole thing down.  Its the entire intelligence community.