I have an ADS-B receiver on a computer here, and am overhead a number of flight paths for JBLM.
The above comment is accurate, plenty of local training helicopter flights will be fully or partly dark (lights and/or transponders off), looking at my receiver's raw output stream.
The above comment is accurate, plenty of local training helicopter flights will be fully or partly dark (lights and/or transponders off), looking at my receiver's raw output stream.