An interesting HF post on another list
1912z 20 Nov 24
11175.0 USB was active at 1824z with DOOM 12 (initially ID'ing as DOOM 72; good/fair levels) popping up on frequency and saying "For RED RIVER; DOOM 72 (restated as DOOM 12); standby; message traffic" (twice); and, into a fast spoken....
3SSS PICOAQAHZCWXXTMHFZHKZTDNCLNWOK (twice); "end of message"
Then, a spoken "End of message NEREP DOOM 11 FLIGHT"
Response: "DOOM 11 in receipt of message"
At this point MAINSAIL responds to "LAST CALLER" but then is quiet.
The above was not read as 3-element groups, but as a single string with a 4-element start of message (3SSS). If you parse the remaining characters they will break to 3-element groups. In fact much of those 3-element groups were contained in yesterday's DOOM 12 message traffic to RED RIVER. Those had the formatting of an AKAC 274 message.
[3SSS PIC OAQ AHZ CWX XTM HFZ HKZ TDN CLN WOK]
Then at 1904z:
"RED RIVER; stand by for NEREP from DOOM FLIGHT" (repeated)
3SSS PICOAGAHZJJTTXKFWPJXLCLNWOK (repeated)
"This concludes NEREP for DOOM FLIGHT"
The 1904z NEREP can be parsed as the 4 element "preamble" and the remainder as 3-element groups, with some commonality with previous traffic.
[NEREP = Nuclear Execution Report; or, more formally Nuclear Execution and Reporting Plan.]
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