Just forget the world tactical, it's mainly used as a marketing device to make the lights sound cooler. Basically, there are two types of clickies (I wont go in to the clickies with two modes by soft/hard press etc)
Regular clicky: Basically, you have a momentary option, (as Maglites), you press the button slightly, it goes on, you release it, it goes off. Or you can press the button completely, hear a click, and release it, and the light is still on. To turn off, just press completely(another click) once
Reverse Clicky: If you press the button, slightly, nothing happens. If you press the button completely(click) and does NOT release it, nothing happens. If you press the button completely and release it, then it goes on. If you press the button slightly while it's on, it's goes off. That's why it's called reverse, if you want to signal with your light, you have to do the opposite(release the button when you want light, and press it slightly when you want it to go off momentarily). To turn off, you just press completely(another click) to turn off.
And then there are momentary twists. You twist on/off the tailcap to get constant on. You press the tailcap when it's twisted off, to get momentary.
Hope that helps.
