This question was recently posted to the UDXF newsgroup:
"I'm new on the list -- do I understand correctly that "EAM" refers to Emergency Action Message? If so, I wonder if all these are related to the weather in the northeast USA."
What is an EAM is a common question that milcom monitors get all the time. EAMs (Emergency Action Messages) have nothing to do with the weather. They are specialized messages transmitted for command and control to various U.S. military units. A basic understanding of what an EAM is can be found at http://monitoringtimes.com/html/eam.html. This was written by the dean of USSTRATCOM monitors Jeff Haverlah.
I added additional and new material to Jeff's piece in this month's Monitoring Times magazine in my monthly Milcom column. In my column titled November-Foxtrot-India-India-Four-Sierra: DoD EAMs revisited, I think the best information comes from the top dogs in DoD, the Joint Chiefs of Staff (JCS).
In a JCS instruction 5721.01D dated February 8, 2008 on Nuclear Command, Control, and Communications (NC3) Hybrid Solution (HS), they wrote: "EAMs are highly structured, authenticated messages primarily used in the C2 (Command and Control) of nuclear forces. EAMs are disseminated over numerous survivable and non‑survivable communication systems, including terrestrial and space systems."
In another online publication published in 2008, the Nuclear Matters: A Practical Guide, Chapter 5 had these two statements: “Emergency Action Message – Use Authorization Control. An Emergency Action Message (EAM) is the medium through which actions involving nuclear weapons are authorized. These messages are encrypted and sent to lower‑echelon units for action. The messages have different formats and may require authentication with sealed authentication code cards depending on the intent of the message. “National Military Command and Control System. The Joint Staff Director for Operations (J‑3) operates the C2 system. EAMs are conveyed to the Combatant Commands through secure communications links.”
There is a lot more to this story so if you are a Monitoring Times print or MTXpress subscriber, you can get the rest of the story including frequency and other comm networks (terrestrial , HF and satellite) info on pages 52/53 of your December 2009 Monitoring Times.
And the article mentioned above is not the end of this story. I have more that I plan on publishing in a future Milcom column in MT. You can get more information on MT and MTXpress at http://www.monitoringtimes.com/ or http://www.grove-ent.com/.
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Milcom Monitoring Post Profiles
- What are Emergency Action Messages (EAM)? Updated 20 September 2021
- UFO Milsat Program
- Fleetsatcom System
- UHF 225-380 MHz Milcom Spectrum Holes: Updated 24 July 2019
- Civilian Air Cargo/Airline/Military Call Signs
- Intl HF Aero Civ/Gov/Mil Frequency List
- USN Aircraft Modex Numbers
- University of Twente Wide Band WebSDR Netherlands
- U.S. Military ALE Addresses
- DoD Air Refueling Frequencies - Update 15 Jul 2016
- COTHEN HF Network – Last Update 22 March 2023
- Monitoring the Civil Air Patrol Auxiliary Update 10 Sep 2016
- US Coast Guard Asset Guide - Update 6 Oct 2022
- The Spectrum Monitor e-Zine Milcom Column Index - Update 17 January 2022
- The Milcom MT Files (1998-2013) Articles Index