# There can be distinctive transmission patterns in these things: The EAMs heard on the GHFS are first heard on the NIGHTWATCH nets on the old GIANT TALK frequencies, plus sometimes still on USN freqs. Usually broadcast by a daily tactical callsigned station, who is the same station each day (sometimes with the same operators), just using a different callsign. The operator works in a very noisy environment - trigraphs, character strings, 'warble tones' can be heard in the background. The operators also use very distinctive diction. Sometimes, the initiating station is NIGHTWATCH 01 itself. Within a few seconds, to a few minutes of this broadcast, the GHFS will lightup with a very powerful carrier, followed shortly by OFFUTT, ANDREWS, or MCCLELLAN with a call to MAINSAIL and start the GHFS rotation of the EAM. (There can be slight variations to this pattern.) Rarely, NIGHTWATCH 01 will pull a station such as MACDILL off to a published discrete frequency, where NIGHTWATCH 01 will dictate the EAM to the GHFS station 'for injection to AUTODIN.' Within seconds of completion, this EAM will be transmitted on the GHFS. Usually, an EAM is broadcast once on the NIGHTWATCH net; once on the GHFS (by all stations except ALBROOK, BAYONNE, and ASCENSION); and that's it. Recently it's been noticed by Ary Boender and myself that CROUGHTON and ANDREWS will rebroadcast an EAM (sometimes at an apparent hourly schedule) hours after the initial GHFS cycle was completed. Also, during self-described exercises the NIGHTWATCH nets will repeat one or more EAMs constantly over varying periods of time but is not joined by the GHFS. On somewhat rare occasion, an EAM can be transmitted 'for' a callsign or multiple callsigns, in which case the message starts something like this: 'for Chewing Gum, for Chewing Gum' followed by the EAM.
* Almost always these 'For...' EAMs are 20 characters.
* Very rarely, they can be variable count EAMs: EAMs 'for' theaters/commands, and something a few months ago for SOARHAWK.
* The only 'for' callsigns that seem to be static in nature (besides the Theater/Command things) are EAMs 'for' REGION "alpha character" (heard: ALPHA; BRAVO; CHARLIE; DELTA); and variable character-count EAMs 'for' SOARHAWK.
* They can happen at any time, but an apparent favorite time for these is between 1200z-1300z (1300z-1400z Standard time) on Tuesdays.