I love a good mystery, but this one is starting to wear on my last good nerve. For years I have known about the Civil Air Patrol (CAP) PARD ## call signs. But I am still not sure a what it is being used for. Anybody that may have a hint or two can contact me at the email address in the masthead.
Now starting to see this call sign show up in the Mode-S c/s field (see below):