[MilCom] MIL: 11175.0 UTC - LIFE BUOY; CORNHILL; and NOONTIDE

Sat Jul 11 21:52:21 EDT 2026

0150z 12 Jul 26

UTC 11 Jul 26

The entire UTC weekend day was atypical and interesting.

An atypical 10 hour overnight (CONUS local) message traffic window.

Two active E6Bs over the ATLANTIC; one apparently over the ATLANTIC off the
southeast coast of CONUS and the other in the orbit areas off the northeast
coast of CONUS.

The very active message traffic activity included a short string (17
characters in this case) often heard during TACAMO LANT activity off the
southeast coast of CONUS; and associated with submarine activity.

The traffic activity ceased at the end of the UTC day.

P1: B7
P2: GP
P3: Nil
P4: UU/QL (change of prefix; 17 days]

0018z: MAINSAIL with test count.

[10 hour traffic window.}
========
0028z: LIFE BUOY; GPOHJM; 63 characters; P2.
GPOJMOG5LRXBBCXZJNKRZ4HKZBB6ABLDWFZBRWTDU2LJKVIMQK2SWTDU2LJKVI6

𝙶𝙿𝙾𝙹𝙼𝙾  [𝙿𝚛𝚎𝚊𝚖𝚋𝚕𝚎; 𝟼]
𝙶𝟻𝙻𝚁𝚇𝙱𝙱𝙲𝚇  [𝟿]
𝚉𝙹𝙽𝙺𝚁 [𝟻]
𝚉𝟺𝙷𝙺𝚉𝙱𝙱𝟼𝙰  [𝟿]
𝙱𝙻𝙳𝚆  [𝟺]
𝙵𝚉𝙱𝚁𝚆𝚃𝙳𝚄𝟸𝙻𝙹𝙺𝚅𝙸𝙼  [𝟷𝟻]
𝚀𝙺𝟸𝚂𝚆𝚃𝙳𝚄𝟸𝙻𝙹𝙺𝚅𝙸𝟼  [𝟷𝟻]

https://neetintel.github.io/structure_heatmap_63char.html
========

========
0407z: LIFE BUOY; UUQIEI; 25 characters; P4.
UUQIEIMKOKDHBCP7C47K7C7FS

[Paired]
0415z: LIFE BUOY; UUDMXB; 63 characters; P4.
UUDMXBCZEGXSPX7NAASW5NLVHODDWINLVHRDZONAASY5NLH7GD6OINLP7GD5GJR

𝚄𝚄𝙳𝙼𝚇𝙱  [𝙿𝚛𝚎𝚊𝚖𝚋𝚕𝚎; 𝟼]
𝙲𝚉𝙴𝙶𝚇𝚂𝙿𝚇𝟽  [𝟿]
𝙽𝙰𝙰𝚂𝚆  [𝟻]
𝟻𝙽𝙻𝚅𝙷𝙾𝙳𝙳𝚆  [𝟿]
𝙸𝙽𝙻𝚅𝙷𝚁𝙳𝚉𝙾  [𝟿]
𝙽𝙰𝙰𝚂𝚈  [𝟻]
𝟻𝙽𝙻𝙷𝟽𝙶𝙳𝟼𝙾  [𝟿]
𝙸𝙽𝙻𝙿𝟽𝙶𝙳𝟻𝙶  [𝟿]
𝙹𝚁  [𝟸]

0527z: LIFE BUOY; UUSUQI; 27 characters; P4.
UUSUQIGCC6GSDPBKLGJD2LG4WDI

0539z: LIFE BUOY; UUYEHN; 31 characters; P4.
UUYEHNGRYPNIHUUMIQNCXLDSWX6WKUC
https://neetintel.github.io/structure_heatmap_31char.html

0608z: LIFE BUOY; B77GH4; P1.
B77GH4JRFIG3PEJSIFEJGBGEXYIGGM
[NCS restoral queue.]

[See https://neetintel.github.io/eam_30char_format_analysis.html and read
the "third - and most striking -" section regarding the last 6 characters
of these 30 character strings.]

0611z: LIFE BUOY; B7I54J; P1.
B7I54JRLHDN2CR7F5SLA6XYT2LIBG6
[NCS restoral queue.]

0633z: LIFE BUOY; B7I54J; B77GH4; h+00/h+30 NCS/ABNCP/GULF restoral
rebroadcast.
0700z: LIFE BUOY; B7I54J; Disregard during the 1st reading of the string.

0935z: LIFE BUOY; GPBWC7; 55 characters; P2.
GPBWC7GHSPR5NNRCZK7VCZKRLWAPOOGQXWSKDF2HWAWOOGJXWSKDF2U

Reformatted for structure.

𝙶𝙿𝙱𝚆𝙲𝟽  [𝙿𝚛𝚎𝚊𝚖𝚋𝚕𝚎; 𝟼]
𝙶𝙷𝚂𝙿𝚁𝟻𝙽𝙽𝚁  [𝟿]
𝙲𝚉𝙺𝟽𝚅  [𝟻]
𝙲𝚉𝙺𝚁𝙻  [𝟻]
𝚆𝙰𝙿𝙾𝙾𝙶𝚀𝚇𝚆𝚂𝙺𝙳𝙵𝟸𝙷  [𝟷𝟻]
𝚆𝙰𝚆𝙾𝙾𝙶𝙹𝚇𝚆𝚂𝙺𝙳𝙵𝟸𝚄  [𝟷𝟻]
========

Quiet.

[1654z+/-: AEC9AE E6B launched from PAX RIVER and flew to the ATLANTIC via
the WILMINGTON area; TACAMO LANT. The E6B eventually reappeared off the
northeast coast of FLORIDA and return north to PAX RIVER by the end of the
UTC day.]

1701z: CORNHILL called MAINSAIL with no response and quiet.
1719z: CORNHILL called LIFE BUOY with no known response.

[Start of major TACAMO LANT activity.]
========
1803z: LIFE BUOY; B7VKZB; disregard.

1804z: LIFE BUOY; B7VKZB; P1.
B7VKZB4WA61422JVAWFDQDF7IYCND3
[Fed to TACAMO LANT.]

1810z: CORNHILL; B7VKZB; h+10/h+40 TACAMO LANT restoral rebroadcast window.

[1820z+/-: 17.8 KHz (LANT) VLF FSK MSK broadcast indicated on the W1VD VLF
Grabber website.]

1840z: CORNHILL; BUVKZB; LANT restoral.

[1859z+/-: AFB67E E6B launched from TRAVIS northbound, and then southbound;
making a round trip within CALIFORNIA before returning to TRAVIS. Backend
call word, if any, unknown.]

[1900z+/-: 17.8 KHz 2nd VLF FSK MSK broadcast indicated on the W1VD
website.]

1910z: CORNHILL; B7VKZB; LANT restoral.

[1921z+/-: AEC135 E6B launched from PAX RIVER southbound to the WILMINGTON
area and cross the coast to the ATLANTIC; and remains over the ATLANTIC at
the end of the UTC day.]

[5 hour message traffic window.]
********
1922z: LIFE BUOY; B76VMJ; P1.
B76VMJUW3V4WUXPUFSUF4JYXJUDQLW
[NCS restoral queue.]

1930z: LIFE BUOY; B76VMJ; NCS restoral.
1933z: LIFE BUOY Standing by for traffic.

1940z: CORNHILL; BUVKZB; LANT restoral.
========

2000z: LIFE BUOY; B76VMJ; NCS restoral.
2003z: LIFE BUOY Standing by for traffic.

2030z: LIFE BUOY; B76VMJ; NCS restoral.
2033z: LIFE BUOY Standing by for traffic.

2101z: LIFE BUOY: B76MVJ; NCS restoral.
2104z: LIFE BUOY Standing by for traffic.

2109z: LIFE BUOY; B7UFXZ; P1.
B7UFXZCYXMCNN3QLPXMBHTPYXDYFU2
[NCS restoral queue.]

2111z: LIFE BUOY; B7KCXF; P1.
B7KCXFWZBTPT3AR3BAAGJLN5WY7GCT
[NCS restoral queue.]

2113z: LIFE BUOY; QLUZJM; 25 characters; P4; change of prefix (17 days).
QLUZJMF7N5RA3QYDQYLZ2IO6U

2116z: LIFE BUOY; B7KJZ4; P1.
B7KJZ4LY2JH2J3OB4GHUIZI52H5S6G
[Not in any rebroadcast.]

[2127z: 22.7 KHz (LANT) VLF FSK MSK broadcast indicated on the W1VD VLF
Grabber and very faint on a California SDR's waterfall.]

[FSK unreadable on the California SDR, so content is unknown. Time
correlation might point to the lone 2113z QL string; the 2116z B7 string
(but it's not in any HF rebroadcast); or the following 17 character string
that always seems to be associated with LANT E6B activity involved with the
subs. Speculation.]

2131z: LIFE BUOY; B7KCXF; disregarded for higher priority traffic.

--------
2132z: LIFE BUOY; GPUYPO; 17 characters; P2; always rare but was expected
once two E6Bs were seen over the ATLANTIC.
GPUYPOHHR3BFAAGJQ
Audio: https://t.co/JfdFt6RfZD
--------

2135z: LIFE BUOY; B7KCYF; B7UFXZ; completion of the interrupted NCS
restoral.

2140z: MAINSAIL with test count.

--------
2143z: LIFE BUOY; GPUYPO; 17 characters; echo rebroadcast.
--------

========
2147z: LIFE BUOY; B7G7RA; P1.
B7G7RA2UWP4SYLNFNYMTKNBATTHKVL
[Fed to the 2nd TACAMO LANT.]

2153z: LIFE BUOY; B7OO7J; P1.
B7OO7JP27NNVK6PJCWDVPAT2OLHKQC
[NCS restoral queue.]

2156z: LIFE BUOY; B7NND4; P1.
B7NND4M6STQX5NVGDPXX6IGSBGRUJV
[NCS restoral queue.]

2201z: LIFE BUOY; B7KCXF; NCS restoral; out (probably for higher priority
traffic).

2204z: LIFE BUOY; GP6TTN; 35 characters; P2.
GP6TTNQZM26Y23AGNS3IL3C2TVGXFUEP24Z

2207z: LIFE BUOY; B7UFXZ; completion of the interrupted NCS restoral.

[2200z+/-: 17.8 KHz VLF FSK MSK broadcast indicated on the W1VD VLF
Grabber.]

2210z: NOONTIDE (presumed AEC135); B7G7RA; LANT restoral.

2218z: LIFE BUOY; B7UFXZ; B7OO7J; B7NND4; NCS restoral (delayed?; re-done;
or ??)

2230z: LIFE BUOY; B7UFXZ; B7OO7J; B7NND4; NCS Restoral.

2340z: NOON TIDE; B7G7RA; LANT restoral.

2250z: LIFE BUOY; B7UFXZ; disregard (too early?; expired?; or ?).

2300z: LIFE BUOY; B7COJO; P1.
B7COJOKA4HXK4GFHR57O2DKS5Q2WET
[NCS restoral queue.

2303z: LIFE BUOY; B7DFCH; P1.
B7DFCHCW3PE6WX43IMFTQRFJT62OZR
[NCS restoral queue.]

[Note the expirations here and at  2330z.]
2307z: LIFE BUOY; B7OO7J; B7COJO; B7DFCH; NCS restoral.

[NOONTIDE obviously waited until the NCS restoral broadcast end; as it
started immediately afterward. Usually they just dual.]
2313z: NOONTIDE; B7G7RA; LANT restoral.

2321z: LIFE BUOY; B7C6RT; P1.
B7C6RT3H7YCAEINPOVEHVD3N7XP4GH
[NCS restoral queue.]

2330z: LIFE BUOY; B7C6RT (2321z); B7OO7J (2153z); B7COJO (2300z); NCS
restoral.
[Final rebroadcast.]
********

2340z: NOONTIDE; B7GZRA; LANT restoral.
[Final LANT rebroadcast.]
========

Very quiet.

AEC135 NOONTIDE (pre 0000z) apparently remains over the ATLANTIC and might
become active again later in the CONUS night.

Jeff
-------------------------------------------------------------------------
Jeff Haverlah               Coastal Texas
     Airspy HF+ Discovery   W6LVP loop  Various web SDRs
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