Arlington Hall
Arlington Hall (also called Arlington Hall Station) was a former girls' school and the headquarters of the United States Army's Signal Intelligence Service (SIS) cryptography effort during World War II. The site presently houses the George P. Shultz National Foreign Affairs Training Center, and the U.S. National Guard Readiness Center. It is located on Arlington Boulevard (U.S. Route 50) between S. Glebe Road (State Route 120) and S. George Mason Drive in Arlington, Virginia.
"Arlington Hall" was founded in 1927 as a private post-secondary women's educational institution, which, by 1941, resided on a 100-acre (0.40 km2) campus and had acquired the name "Arlington Hall Junior College for Women". The school suffered financial problems in the 1930s, and eventually became a non-profit institution in 1940. On June 10, 1942, the U.S. Army took possession of the facility under the War Powers Act for use by its Signals Intelligence Service.
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). Arlington Hall concentrated its efforts on the Japanese systems (including PURPLE) while Bletchley Park concentrated on European combatants.
...
Wikipedia