Radio-tard here. Been listening to shortwave all day and the military has been sending an abnormally high amount of EAMs (Emergency Action Message)Most have been from Andrews AFB and Offut AFB

For those who don't know what an EAM is here is some info: [link to mt-milcom.blogspot.com]
[link to en.wikipedia.org (secure)]

And here's an example of what one sounds like: