A prepared mindset with an emphasis on the everyday carry.
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The Grayman Doctrine
This document will provide the skills and mindset to navigate in a non-permissive public environment that would potentially expose you to harm or divulgement of sensitive information. Explore how to avoid becoming a target of crime, enhance your ability to react to active threats, egress from close proximity disasters, collect and interpret observed data, and more.
This handkerchief fits in your pocket and does everything a gentleman's tissue would do... but it also is lined with a Faraday Shield to allow you to go black and undetected, protect yourself from harmful signals, and defend your devices from EMP attacks.