by Darius Kazemi, March 13 2019
RFC-72 is by Robert D. Bressler of MIT's Project MAC. It is titled “PROPOSED MORATORIUM ON CHANGES TO NETWORK PROTOCOL” and dated September 28th, 1970.
The technical content
Bressler is asking for a freeze on changes to the Host-Host protocol. He is asking for this because many sites have been using the old protocol for almost 6 months and have written a lot of software that uses them. He proposes that only critical changes be considered, rather than changes that would simply increase efficiency. The general gist here is: let's stick with what we have right now and measure its characteristics before redesigning it.
I was waiting for a note like this to come along. Crocker and others were proceeding on the assumption that Host sites would simply have to make the changes necessary to their software to work with the new protocol. It was only a matter of time before someone raised an objection to this.
Robert D. Bressler went on to be a vice president at BBN, and is quoted in this 1983 New York Times article about the splitting of the ARPANET into MILnet (military) and R&Dnet (civilian).