Norway leaves network to become an Internet connection via TCP/IP over SATNET; UCL does the same

DCA and ARPA establish the Transmission Control Protocol (TCP) and Internet Protocol (IP), as the protocol suite, commonly known as TCP/IP, for ARPANET. (:vgc:)
This leads to one of the first definitions of an "internet" as a connected set of networks, specifically those using TCP/IP, and "Internet" as connected TCP/IP internets.
DoD declares TCP/IP suite to be standard for DoD (:vgc:)

EUnet (European UNIX Network) is created by EUUG to provide email and USENET services. (:glg:)
original connections between the Netherlands, Denmark, Sweden, and UK

Exterior Gateway Protocol (RFC 827) specification. EGP is used for gateways between networks.