First, a hearty "Thank You" (I can't ever say it enough) to all the first responders, and others who put themselves in harms way every day.
Second, this is certainly a fair question. For me it's a no brainer though, as I am lucky enough (I think) to work in a family owned insurance business/office, where safety and family ALWAYS come first, so a GHB is the only real concern I have. DW on the other hand works at the local hospital as a Social Worker, and COULD be considered essential personnel in the right emergency. Though she works on the physical rehabilitation floor, I have no doubt she could be sent to the ER or other area of the hospital and would gladly go if needed (she is VERY special that way). One of the hospital's contingency plans in the case of closed or bad roads is that those who are at the hospital already STAY until the danger/emergency is over. In the event they need to call in additional personnel, National Guard Hummer's are usually available, depending on the type of disaster/emergency. Our biggest concerns here are flooding, snowy roads (it doesn't take much to make things slippery and dangerous and we occasionally get unusually LARGE amounts of snow that result in road closings, tho that hasn't happened in a LONG time), or other natural disasters (this spring, we narrowly escaped the damaging tornadoes that struck our neighboring counties).
Finally, thinking through it, I agree that a properly equipped GHB would have MOST of the items a GTW bag would have (other than, as you mentioned, the appropriate ID and job-related items). I am guessing most are counting on that but thinking in the opposite direction (i.e. GTW bag) is certainly a worthwhile exercise.
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Uh ... does anyone have a match?