I'm hearing the MD National Guard freqs all busy with a data stream that is probably encrypted voice traffic. Active freqs are 139.0625 (East), 139.5125 (West) and 139.9625 (Central). Time is 8:40 p.m. It's continuing at 8:45 and the 139.9625 freq is almost certainly encrypted voice since there are two distinct transmitters going back and forth. The Central and West freqs are the loudest from my location.
[Edit] The activity has continued for 45 minutes now. Agree with Mark...time to lock out all that noise.