Great Lakes Citadel

The Great Lakes Citadel was an immense fortress tower built in a lake in the former state of Michigan, somewhere near Lake Huron & Michigan. It served as the first main fortress for the Alliance for the Survival of Humanity. It was destroyed in a battle against the shadowghosts & the newly formed League of Imperial Cybernetic Hybrids.

Destruction
The Citadel was besieged & destroyed in a mass assault made by the shadowghosts, who were accompanyed by an army of robots that called themselves the "Imperials". The two armys had joined forces & stormed the tower, bombing & blowing it up from the inside & out. It is most likely that the shadowghosts found the citadel because Cyber Erol, who used to be Erol, the soldier who died in the Battle for the Battery & was now leader of the League of Imperial Cybernetic Hybrids, disclosed the location out of memory as he saw his former allys as enemys that had conspired to kill him.