If you have ever served in a military branch that dominantly conducts ground warfare, or have served in the smaller elements of the other two branches that don’t, then you already know the difference between cover and concealment.  (LEOs, you get a pass on this one, as well.)  A lotta people out there do not know the difference.  No biggie.

Until it IS a biggie, and you’re trying not to get shot or blown up.

As probably most of America has heard or learned at this point, when some sort of kinetically derived emergency happens–active shooters, explosions, etc.–you are supposed to do one, two, or all, of three things:

1)  Run.
2)  Hide.
3)  Fight.