SDS=Signals Dispatch Service via m/c, 1/4T or any other motorized means.
SDS was set up at a Signal Office and operated over a scheduled route delivering/forwarding dispatches routed to various HQ.
In the event of a Op Immed, or Flash message, an SDR (Special Dispatch Rider) could be used.
DR service had a higher security integrity than either wrls or line.
Bruce Parker...tut,tut...you shoulda knowed better!!!
