[ih] Correct name for early TCP/IP working group?

[Barbara Denny]

 TCP existed prior to 1983 in hosts attached to the various networks that comprised the Internet.  ARPAnet was just one of the networks on the Internet during this time period. Flag day marked the day when NCP would no longer be supported in the ARPAnet. Hosts attached to the ARPAnet needed to use TCP or they would essentially be disconnected.
Perhaps the network diagrams in this brochure will help you.  Unfortunately I had trouble just grabbing the image of the 1976 2 network internet transmission (Packet Radio and ARPAnet ) so I am including the entire publication. 
https://computerhistory.org/wp-content/uploads/2019/08/core-2002-02.pdf

barbara
    On Tuesday, January 28, 2025 at 10:04:22 PM PST, Lars Brinkhoff via Internet-history <internet-history at elists.isoc.org> wrote:  
 
 Jack Haverty wrote:
> SATNET, and ARPANET, were both continuously managed by the NOC at
> BBN. TCP, and a collection of "core gateways" had become increasingly
> important to users, especially in the UK in Peter Kirstein's group,
> which had to rely on TCP through SATNET to access computers in the US.

This would have been before 1983, correct?  I'm curious which
(important) computers were avaiable through TCP?

It seems to me the transition from NCP to TCP was somewhat gradual.
Many histories make a big deal out of the 1/1/83 flag day, as if the
entire network switched from NCP-only on one day, to TCP-only the next
day.  But reading more carefully, I gather some hosts were TCP only or
dual TCP/NCP long before that.  Is that correct?
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