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Base of Operations
Formerly Xavier Institute for Higher Learning, Westchester, New York
House of M: The Day After (2006)
Unknown, possibly none
Many of the mutants that retained their abilities were relocated to a tent city on the grounds of the Xavier Institute, "protected" by Sentinel Squad O*N*E. Since this group includes many former X-Men villains, the arrangement was strained at best. After learning that early U.S. government estimates cited only 198 mutants remaining, those mutants living on the Xavier Institute grounds sought a symbol to rally around and adopted the name "198" for themselves.
Recently, X-Force organized an assault in the X-Mansion to free the 198 from the grounds, leading them to an abandoned military base. However, they were founded by some of the X-Men, and also by Bishop and his squad, which was attacked by Cyclops (Johnny Dee manipulated Cyclops). The confrontation began, and they knew that the military base would be destroyed, with 198 inside.Val Cooper discovered the manipulation of Johnny Dee and warned Bishop, who asked for the confrontation stop. Iron Man and Ms. Marvel arrive to help, and with effort, they save the 198, which once received the freedom to leave the X-Mansion.