FWIW, some may not have known the Navy was a part of the Army's SCAN(switched circuit automatic network) from the gitgo:
12-29-61 SCAN([Army]Switched Circuit Automatic Network) activated using 4W #5 switching machines at: Hillsboro,MO;Monrovia,MD(Frederick#2 at that time);Rockdale,GA;Santa
1-5-62 The Navy joined the Switched Circuit Automatic Network.
About 50 Navy activities have direct connections to one of the four switching terminals.
(above snippet from www.dtic.mil/dtic/tr/fulltext/u2/407626.pdf )
11-1-63 NORAD/ADC Automatic Dial Switching Network activated using existing SCAN and 4W #5
switching machines at: Colorado Springs,CO;Ennis,TX;Norway,IL;Rosendale,NY.
4-19-64 AUTOVON(Automatic Voice Network) was born with the merger of SCAN and NORAD/ADC
switched networks to provide one military switching system.