I realized I can post it. So here it is:
SKYKINGS are messages to SIOP assets. The one you posted was to a all SIOP units SKYKING messages are cross service-meaning they can go to any branch of the armed forces that have nuclear/ National Command Authority taskings.. SIOP(Single Integrated operational plan) means our game plan for whatever OPLAN (operational plan, what SIOP is now. OPLANS are “playbooks” for whatever situation/crisis/country we’re about to tangle with) is about to be used.
Think we know which ones are being dusted off in the basement of the puzzle palace tonight.
Here is a site where SKYKING messages are logged and where you can also listen to them.
The more times the announcer says “SKYKING” at the beginning of the message, the more urgent it is. 4 Skykings means DEFCON 1 essentially. 2 or 3 SKYKINGS at the beginning of the message usually denote operational orders. Something to keep in mind.