The question is: why would she wear it at call? It's kind of funny for Louisianans to see anyone wearing raincoats. They do NO good in southeast Louisiana because of the humidity. You won't see any natives wearing them.
I suspect that she wears it at all because it lends an image of being prepared and in command or something. Either that or she's been in DC too long (which is redundant because a day is too long for her to be there).
LOL
My thoughts reflect yours.
Would have made the "perfect picture" if she had worn a hard hat as well.