I stumbled on this while going through the SDR recordings. At first I thought it was just MARS, but it turned out to be an American EE OM with a 30 character message, starting with WSC34N, and closed with "this is 8 Echo Yankee, out". The 30 characters were sent as 5 groups of 6 characters, letters and numbers.
It did have a bit of a .mil feel to it, but certainly not the typical MARS traffic. Any ideas?
A different EE OM at 0720, another 30 character message starting with WSC34N but different characters. Also signed 8 Echo Yankee.
The number "5" sounded a lot like "Fife". They did use Foxtrot, so it was a 5 and not an F.
Another? OM back at 0750. Also, the "3" sounded a lot like "tree". Off at 0755.