One of the many programs that DARPA has been working on is called the vanishing programmable resources project. The idea with this project is to make the electronic devices fielded by the military destroy themselves on command to prevent the tech from falling into enemy hands. One of the products resulting from this project is a chip built by Xerox PARC.

The PARC chip will self-destruct on command and could be used to store data such as encryption keys that could be destroyed on command rendering the keys unrecoverable. Researchers at Xerox working on the project say that they wanted to create a system that was comparable to commercial electronics.
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https://www.slashgear.com/xerox-parc-chip-self-destructs-on-command-14404363/