True for Packet switching, it was concieved ( Baran early 60s, Davies 1965) to "withstand heavy enemy attacks".

Decommissioned Internet precursor ARPANET was allegedly designed " to meet the needs of military command and control against nuclear threats,"

Im not sure about todays Internet, some say it is largely centralized. Other military networks have been separated from it.

In some cases whole countries were taken off from Internet by someone cutting backbone cable with a shovel.