SKYKING messages are special EAM's. These presumably could be the nuclear go/no-go codes. There was a higher than normal number of EAM's and SKYKING messages being transmitted after the attackes of 9/11/01. Urgent SKYKING messages are repeated three or four times instead of the usual two. SKYKING is a group callsign, meaning "Any this net." "Do not answer" is the standard procedure ofr self-authenticating broadcasts, meaning that recipients don't need to give away their positions or existence by challenging the orders. While tuned to any of the HFGCS frequncies and hear "SKYKING SKYKING Do not answer" you can bet you're hearing a very important, highest priority, and heavily encrypted message!

[link to www.milaircomms.com]