| 10/7/1991 | After a call-out signal from "B," he and the KGB carry out an exchange operation at a dead-drop site. |
| 12/12/1991 | KGB receives an envelope from "B" at an accommodation address. |
| 12/16/1991 | "B" and the KGB carry out an exchange operation at a dead-drop site. This is the last dead drop. |
| 12/25/1991 | The USSR ceases to exist. Priscilla Galey goes back to Columbus, OH. She leaves Hanssen no note. |
| 1/6/1992 | Hanssen serves as Chief of the National Security Threat List Unit in the Intelligence Division (renamed the National Security Division in 1993) at FBI Headquarters. |
| Feb. 1993 | Hanssen allegedly clashes with Kimberly Lichtenberg, a civilian FBI employee, after she walks out on a meeting. |
| 4/1994 | Hanssen is temporarily assigned to the FBI's Washington Metropolitan Field Office (now called the Washington Field Office). |
| 12/1994 | Hanssen is reassigned to FBI Headquarters, in the Office of the Assistant Director for the National Security Division. |
| 2/12/1995 | Hanssen is detailed to serve as FBI's senior representative to the Office of Foreign Missions of the United States Department of State (DOS/OFM). |
| 12/18/1996 | FBI Special Agent Earl Edwin Pitts is arrested and charged with espionage. |
| 7/1997 | Hanssen conducts first of 10 searches of the FBI's collected computerized databases of classified and unclassified investigative files and indices for the purpose of determining whether the FBI was aware of recent dead drops in Virginia -- or of operational activity at Foxstone Park. |
| 1998 | Hanssen works at the Office of Foreign Missions - State Department. |
| 10/2000 | The "B" files are given to the Bureau by a Soviet contact via the CIA. The FBI begins investigating Hanssen. |
| 12/12/2000 | FBI surveillance observes Hanssen driving four times past the Foxstone Park sign in Vienna, VA. (It is the signal site associated with a dead-drop site, which was used from early on in the KGB's "B" operation.) FBI surveillance personnel observe Hanssen walking into a store near Foxstone Park at the same time as a known SVR officer is in front of the store. |
| 1/9/2001 | Hanssen is observed stopping in front of the Foxstone Park signal site. |
| 1/13/2001 | Hanssen is assigned to a newly created position in the Information Resources Division at FBI Headquarters so the FBI can more effectively monitor his daily activities without alerting him to their ongoing investigation of him. |
| 1/23/2001 | Hanssen is observed coming to a rolling stop near the Foxstone Park signal site. |
| 1/26/2001 | Hanssen drives slowly past the Foxstone Park signal site. |
| 1/30/2001 | The FBI searches Hanssen's Ford Taurus. |
