Know and use the OODA cycle and color code of awareness levels. You life depends on it.
The latest edition of The Tactical Wire is the Concealed Carry Special Edition. It includes an article about the OODA Cycle that I authored.
The OODA cycle, frequently referred to as the OODA Loop, was developed by the late Colonel John R. Boyd, USAF. The OODA cycle has subsequently become highly influential in thinking about how to conduct combat operations at all levels from the tactical to the grand strategic. It is often simplistically depicted with only four components in a circle, although that hardly does justice to the depth of Boyd’s thought.
What it’s not is what is so often pictured.
A better way to look at it would be this:
The article is my explanation of why. There are several other good articles also.