5 E-6s active at once is not unusual. Twice in a week is, however there have been indications of some kind of prolonged STRATCOM related exercise for the last couple of weeks.
On the 21st, an E-6 met up with two E-4s over Nashville for a loop around the Mid-South before carrying on.
On the 25th, five E-6s were active at the same time, all over the mainland US.
Last night's activity saw simultaneous activity over the Pacific, Gulf and Atlantic in addition to the missile fields.
This is coupled with increasing traffic on HF and current world events have made some folks a bit edgy.
You can try to read the tea leaves all you'd like, but the time to worry is when you can't see or hear the activity.