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 operations undertaken from 1967 to 1973 named operation MINARET and operation SHAMROCK. Id. at 4.

The Government asserted the state secrets privilege and moved for dismissal for the following reasons: (1) discovery would "confirm the identity of individuals or organizations whose foreign communications were acquired by NSA"; (2) discovery would lead to the disclosure of "dates and contents of such communications"; or (3) discovery would "divulge the methods and techniques by which the communications were acquired." Halkin, 598 F.2d at 4-5. The district court held that the plaintiffs' claims against operation MINARET had to be dismissed "because the ultimate issue, the fact of acquisition, could neither be admitted nor denied." Id. at 5. The district court, however, denied the Government's motion to dismiss the plaintiffs' claims regarding operation SHAMROCK, because it "thought congressional committees investigating intelligence matters had revealed so much information about operation SHAMROCK that such a disclosure would pose no threat to the NSA mission." Id. at 10.

On appeal, the District of Columbia Circuit Court affirmed the district court's dismissal of the plaintiffs' claims with respect to operation MINARET but reversed the court's ruling with respect to operation SHAMROCK. In reversing the district court ruling regarding SHAMROCK, the circuit court stated: "... we think the affidavits and testimony establish the validity of the state secrets claim with respect to both SHAMROCK and MINARET acquisitions; our reasoning applies to both. There is a "reasonable danger", (citation omitted) that confirmation or denial that a particular plaintiff's communications have been acquired would"

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