While on holiday last week I stumbled across some interesting transmissions on 11175kHz, my immediate reaction was some form of 'number station' however the messages finish with "Andrews Out" The American accent made me think immediately of Andrews Air Force base.
A bit of Internet research and I identified the transmissions as being part of the High Frequency Global Communications System (HF-GCS) and these messages being Emergency Action Messages (EAM) whilst apparently originally designed as part of the U.S. military's strategic nuclear weapon command and control system, they must have other uses during peacetime (I hope)
There is an interesting post on the Milcom Monitoring Blog which has more details about what they may be.
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