Of the four Industry-tested, Military-approved promotional videos hyperlinked at the title source, I find the third one scariest.
As you watch, try to keep a few questions in your mind. Who are these people - how would you describe them if you met at the corner store? What exactly are they doing? Where does it look to be taking place? Will you be able to tell when you are being targeted? How? Pay attention to the implied answers to these questions: as they atttempt to remain unasked..