As useful today as it was when written. I found the conversational tone Allan Dulles writes with here engaging & the subject matter even more so.

For a good example of a relatively-modern day attempt at op-sec, that goes beyond a directional antennae and public wifi:

'When Cybercriminals with Good OpSec Attack' https://www.youtube.com/watch?v=zXmZnU2GdVk

I'd be intrigued to find similar/more recent breakdowns if anyone has any links.