ARPANET architects decide to replace the existing Network Control Program (NCP) with TCP/IP on all ARPANET hosts. By June 1983, every host was running TCP/IP. After 1983, ARPANET underwent a number of significant transformations: the military users left for their own network and the ARPANET became part of a larger system — the Internet. By 1984, the fledgling Internet connected over 100 universities and research facilities in the United States and Europe.
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