As a member of the 123d, I can tell you that we have had the phone call before and it turned out to be true. You take them all serious until some returns a radio call.
A few tense moments....
I agree, I was in the command post most of my career and there's nothing quite so frustrating and serious as getting that call and knowing you've got a C-130 or 141 on a low level. Plus having to call the Wing Commander and have him stand behind you until you hear from the plane.