This information is surprisingly hard to come by.

I'm growing more and more fond of the many use cases of the Raspberry Pi devices, especially now that version 3 sports a 64-bit multi-core processor. When using a Raspberry Pi as a micro server, you probably don't want to leave its built-in wireless radios active. I have come across lots of scattered and inaccurate information, which I aggressively condensed and compiled into working form here, for posterity.

If on Raspbian (usually), run:

systemctl disable wpa_supplicant
systemctl disable bluetooth
systemctl disable hciuart

Add to /boot/config.txt:

# Disable WiFi and Bluetooth
dtoverlay=pi3-disable-wifi
dtoverlay=pi3-disable-bt

Reboot.

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