The 455th Chemical Brigade was reactivated on 4 June 2000 at Fort Dix, under the command of Colonel Joseph Leonelli. Assigned to the 77th Regional Support Command, it included the 462nd Transportation Battalion at Trenton and the 479th Chemical Battalion at Fort Tilden. After the Collapse of the World Trade Center the 479th's 320th Chemical Company at Jamaica, Queens was alerted in case decontamination was necessary.