Being able to pass through a area unseen is a difficult but useful skill. If you had to bug out due to some regional emergency or even if SHTF, you may have to travel through an area with people who might present a threat. The idea of doing this is called being a Gray Man.
A lot of people talk about being the Gray Man but how exactly do you really do that?
Being a gray man is second nature to those who do surveillance or intelligence operations around the world. This article gives five great lessons learned from years of doing and teaching such operations.
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