We offer the FBI's 23-page affidavit of charges against David Sheldon Boone, ex-NSA cryptanalyst who allegedly passed top secret SIGINT, EW and nuclear targeting plans to the Soviets: http://jya.com/dsb100998.htm Tantalizing hints on means and methods, quoting the affidavit of the FBI agent in charge: On one occasion, "Igor" [Soviet agent] told BOONE that the KGB/SVRR had access to United States Signals Directive (USSID) Zero, which was an index of all other USSIDs, and from this index IGOR asked BOONE to obtain specific USSIDs. I have ascertained that USSIDs are classified NSA publications for use in providing Signals Intelligence (SIGINT) support to the United States military. BOONE told the OA [FBI Operational Asset posing as Soviet agent to set up Boone] that he had given "Igor" a photocopy of an NSA document entitled "United States Signals Intelligence Directive (USSID) 514," dated May 6, 1988. BOONE told the OA that this USSID was unusual because it was one of few USSIDs to be classified TOP SECRET rather than SECRET. BOONE told the OA that USSID 514 was not widely disseminated but that one copy had been at USAFS Augsburg. And more on Boone's training and duties in cryptanalysis at Fort Meade and in Germany. Bad Ausburg is the location of one of the NSA intercept stations for the Echelon program is it not?