During the War, Arlington Hall was in many respects similar to Bletchley Park in England, only one of two primary cryptography operations in Washington (the other was the Naval Communications Annex, also housed in a commandeered private girls' school).
Rosen also contributed his engineering talents during and after the war at Arlington Hall, after the S.I.S. became the Army Security Agency, later to become AFSA and finally the present National Security Agency.
Sometimes in the thirties, Martin also opened a subsidiary institution, Arlington Hall, in the Virginia outskirts of Washington, D.C. During World War II, Arlington Hall was closed, and the facilities came under the control of the government, which operated it as an American Bletchley Park—a super secret facility where enemy radio messages were carefully decoded.
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