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'''Arlington Hall''' was the headquarters of the US Army's [[Signal Intelligence Service]] (SIS) cryptography effort during [[World War II]].  It was named for its location in Arlington Hall Station, Arlington, Virginia—a private girls' school which was commandeered during the War.  Arlington Hall was in many respects similar to [[Bletchley Park]] in England, though military and only one of two primary cryptography operations in Washington during the War (the other was the Naval Communications Annex, also housed in a commandeered private girls' school). Arlington concentrated its efforts on the Japanese systems (including PURPLE) while Bletchley Park concentrated on European combatants.  Arlington Hall eventually became one of the organizations and facilities of the [[National Security Agency]] after it was created.

'''Arlington Hall''' was the headquarters of the US Army's [[Signal Intelligence Service]] (SIS) cryptography effort during [[World War II]].  It was named for its location in Arlington Hall Station, Arlington, Virginia—a private girls' school which was commandeered during the War.  Arlington Hall was in many respects similar to [[Bletchley Park]] in England, though military and only one of two primary cryptography operations in Washington during the War (the other was the Naval Communications Annex, also housed in a commandeered private girls' school). Arlington concentrated its efforts on the Japanese systems (including PURPLE) while Bletchley Park concentrated on European combatants.  Arlington Hall eventually became one of the organizations and facilities of the [[National Security Agency]] after it was created.