323.800
Frequency has been used for EAM's from airborne command post aircraft for some time, currently the E6B Mercury series, mostly. I've caught them on 311.000 and 321.000, too - but only rarely. I've actually never heard one on 323.800, nice catch. This afternoon I had a WBFM/MPX Northstar downlink burning from what I'm guessing was an airborne command post on 230.900. Are you in the Midwest? I'm just outside of Chicago. The footprint on these signals can be hundreds of miles in radius.
My understanding is these transmissions are one the backups to the Milsat satellite feeds for the folks down in the ICBM silos. Happy Scanning! - Ted