"In , the adopted the use of TCP/IP protocols on ARAPANET, which by this time, consisted of more than 100 nodes. The military felt that separate resources were needed for research and military uses. Thus, MILNET was established for the exclusive use of the military while ARAPANET continued to be a tool dedicated to government related research. ARAPANET and MILNET became separate networks when the term "Internet" was expanded to include the academic and research computer networks that were emerging. The proliferation of the IBM compatible personal computer, which sold over 75 million machines in the early , provided an increasing number of researchers and scholars access to computer networks. Groups of universities within various regions of the country began to form networks, some with , to exchange and other ."