was sidelined for the remainder of the war, as ultimately was Joseph Rochefort in Hawaii. With Japanese advances in the Philippines, a possible invasion of Hawaii, and greater demand for intelligence, OP-20-G undertook two courses of action: The staff and services of CAST were progressively transferred to a newly formed US-Australian-British station, FRUMEL in Melbourne, Australia. Another signals intelligence center, known as NEGAT was formed in Washington, using elements of OP-20-G headquarters. Naval Communications Annex In Summer 1942 the Navy went through the motions of perhaps co-locating with the Army's SIS but Commander Joseph Wenger had picked out the "perfect new home" for the rapidly expanding OP-20-G and commandeered a private girls' school Mount Vernon College for Women for $800,000 (a fraction of what the buildings and grounds were worth), in 1944, compensated $1.038 million. So on 7 February 1943 it opened at what was called the "Naval Communications Annex", and staff moved in over the next two months. Section Evolution (July 1922-March 1935) Code and Signal Section (Op-20-G), Division of Naval Communications (DNC), OCNO (July 1922-March 1935). (March 1935-March 1939) Communications Security Group (Op-20-G), DNC, OCNO (March 1939-September 1939) Radio Intelligence Section (Op-20-G), DNC, OCNO (October 1939-February 1942) Communications Security Section (Op-20-G), DNC, OCNO (February 1942-October 1942) Radio Intelligence Section (Op-20-G), DNC, OCNO (October 1942-July 1946) Communications Intelligence Organization (Op-20-G), DNC, OCNO July 10, 1946 All Naval communications intelligence elements were collectively designated "Communications Supplementary Activities" of the 20th Division of the Office of Naval Communications, Section 2, (Op-20-2) See also Andrew Gleason, one of the OP-20-G members during World War II Fleet Radio Unit United States Naval Computing Machine Laboratory US Army SIS United States Coast Guard Unit 387 References and further reading External links Office of the Chief of Naval Operations Attack on Pearl Harbor Cryptography organizations Military communications of the United States Defunct United States intelligence agencies Signals intelligence of World War II