DISA's role in DoD information management continued to expand with implementation of several Defense Management Report Decisions (DMRD ), most notably DMRD 918, in September 1992. DMRD 918 created the Defense Information Infrastructure (DII) and directed DISA to manage and consolidate the Services’ and DoD's information processing centers into 16 mega-centers. During the 1990s, DISA fielded new systems to support the combatant commands. The Global Command and Control System (GCCS) and the Joint Chiefs’ C4I (Command, Control, Communications, Computers, and Intelligence) for the Warrior, and the Defense Message System were among the critical systems. GCCS was developed to replace WWMCCS, which had been in existence since the early 1960s.