[Steven W.]

I wonder if CASTLE_ROCK is Camp David?

[CJ Wolf]

USCGC_Castle_Rock_(WAVP-383)

That seems old though. de commed in 71.

[Steve Van Doorn]

CASTLE_ROCK is a town in Colorado near Cheyenne Mountain. This suggests a major threat is taking place

[TruthWillWin]

I wonder if CASTLE_ROCK is Camp David?

Not sure have seen different decodes here, 8kun and QAanon twitter followers.

Some think it is White house secured, some Norad in Cheynne Mt (close to town of Castle Rock), some think it is reference to Castling in chess and so on?

Like many things Q posts we will find out someday.