Embassy Visits
(From the NSA Handbook)

Since a significant percentage of all espionage activity is known to be conducted through foreign embassies, consulates, etc., Agency policy discourages visits to embassies, consulates or other official establishments of a foreign government. Each case, however, must be judged on the circumstances involved. Therefore, if you plan to visit a foreign embassy for any reason (even to obtain a visa), you must consult with, and obtain the prior approval of, your immediate supervisor and the Security Awareness Division (M56).