At Notes from the Technology Underground, Bill Gurstelle has a fascinating entry about the code words the government uses to report a nuclear attack.
"PINNACLE/NUCFLASH" are the flagwords or header that presages an electronic transmission through the U.S. military's command and control structure that reports an actual or possible detonation of a nuclear weapon. Not only that, these code words mean that the explosion was not an accident and the risk of nuclear war is imminent.
As one might expect, "PINNACLE/NUCFLASH" has the highest precedence in the OPREP-3 reporting structure. Men and women train for months, years, in order to be able to coolly and efficiently handle the communications that follow an OPREP-3 PINNACLE level flagword. There are several OPREP-3 code word designators with a chilling cold war/Tom Clancy/John Lecarre ring to them. None of these foreshadow good news.
