Universe Marvel Universe Base of Operations Office of National Emergency Sentinel Squad Central Command, New Mexico Current Members: Alexander Lexington, Nathaniel Briggs, Jake Slayton, Rajani Dhama, Tracy Skylark Former Members: Jennings, Jeremiah Muldoon, Randall Nixon, Emil "The Professor" Winston Other Members (Honorary, Reserve, etc.): General Demetrius Lazer (Director), Valerie Cooper (Deputy Director), James Rhodes (Combat Instructor), Colonel Miguel Reyes (Commanding Officer, Xavier Institute security team) First Appearance House of M: The Day After (2006) Significant Issues Sentinel Squad O*N*E #1-5 (2006)

As part of the U.S. government's efforts to stabilize the mutant situation following the advent of "M-Day", the Office of National Emergency (O*N*E) proposed to revive and retool the Sentinel program. To that end, the O*N*E contracted Stark Industries to upgrade existing Sentinels, as well as acquiring offensive and defensive improvements from S.H.I.E.L.D., to form a new breed of Sentinels designed to be operated by human pilots. This group of Sentinels is unique in that they are piloted, as opposed to the traditional robotic Sentinel. The current group was trained by James Rhodes (War Machine).

The Sentinel Squad program endeavors to train a new generation of controllable, dependable, repairable, replaceable, customizable, and loyal American heroes that are supervised by the O*N*E and trained to follow a military command structure.

Sentinel Squad O*N*E was deployed at the X-Mansion to protect the mutants in case any enemies used this low point as an opportunity to attack them at their weakest, and also to stop the mutants in the event of a revolution.