http://www.armyg1.army.mil/MilitaryPersonnel/PPG/Hyperlinks/Adobe%20Files/FGR%20CDRsGuide.pdf
FWIW...
I wonder if someone at Comcast is pushing buttons they don't understand in the control booth? It seems strange that random alerts are being sent out that would be directed towards military families. . . that only appear for split seconds, not long enough for most people to read or react to them.