Increases in CBNRC's authorized establishment came in at least three steps during this initial phase. The first increase, in late 1947, added 48 positions (for a total of 227) to cope with the INFOSEC responsibilities CBNRC acquired at that time.
The second, a pair of increases authorized during the winter of 1950-51, added a total of 222 positions "to cope with a large-scale extension of CB's SIGINT responsibilities."  An additional increase of 20 positions early in 1952 probably was also part of this increase in CBNRC's SIGINT establishment, as the Canadian government continued to respond to the deepening Cold War.
Finally, the third increase or, more likely, set of increases (about which there is little information) came in the mid- to late-1950s, adding approximately 120 positions to CBNRC's establishment, for a total of nearly 600 (the exact figure may have been 587). This third set of increases probably reflected both continued growth in CBNRC's SIGINT responsibilities, particularly with respect to Soviet air force and air defence activities and North American air defence, and continued growth in CBNRC's INFOSEC responsibilities, including the addition of Electronic Emission Security (ELSEC) responsibilities in 1959 and TEMPEST responsibilities early in 1960. 
The first increase, to approximately 600, seems to have been made in the late 1970s, possibly late in 1978 or early in 1979. It is possible that CSE's authorized establishment was already at the 600 level, in which case this minor ``increase'' might simply reflect greater success in maintaining CSE's strength at the level of its authorized establishment.
The second increase, to approximately 645, seems to have been made early in 1981.
The third increase, to approximately 670, seems to have been made in mid-1983. The 1983 increase probably was related to the revitalization of CSE's cryptanalysis effort; it was at approximately this time that CSE management approved an extra 14 person-years for CSE's cryptanalysis section.
The fourth increase, to approximately 720, seems to have been made in mid-1985; this increase roughly coincided with CSE's move into the field of satellite communications interception and processing, and it may have been related to this development. At roughly the same time, the government made the decision to construct a major addition to the Sir Leonard Tilley Building, nearly doubling the size of the building.
Finally, the fifth increase, to approximately 900, seems to have been made in mid-1987, possibly as one of the decisions made during the defence policy review related to the White Paper released in June of that year. One of the reasons for this increase seems to have been to enable some CSE analytical sections to establish "quick reaction reporting teams" and to operate 24 hours a day, seven days a week. (Prior to 1988, only the CANSOC and CSE's communications and computer sections were 24/7 operations.)
Of course, none of these increases was instantaneous: it took approximately three years, from 1987 to 1990, for example, for CSE to grow from 720 to its new establishment of about 900.
As during the 1950s, the 1980s increases in CSE's establishment seem to have been tied both to CSE's SIGINT responsibilities and to its INFOSEC responsibilities. Specific SIGINT changes included the probable adoption of greater responsibility for the processing of material intercepted at Alert (coinciding with the completion of the High Arctic Data Communications System in 1982); the modernization and enlargement of CSE's cryptanalytic activities; the adoption, starting around 1988, of a 24-hour, 7-day operating schedule by a number of analytical sections; and the already-mentioned (and still continuing) move into the field of satellite communications interception and processing. INFOSEC changes included, among others, the implementation of the federal government's STU-III secure telephone capability, and the creation in August 1988 of the CSE System Security Centre "to augment the computer security expertise of the RCMP and DND and to provide new capabilities for the evaluation of computer and network security products for the Government of Canada."
Fiscal year Staff 62 initial strength, 179 authorized establishment 1946-47 73 (March 1947) 1947-48 95 (October 1947); 227 authorized (late 1947) 1948-49 123 (1949) 1949-50 175? 1950-51 225?; 393/449 authorized (November 1950/March 1951) 1951-52 286 (early 1952); 469 authorized (early 1952) 1952-53 350?; 304 (July 1952) 1953-54 385?; 363 (July 1953) 1954-55 420 (March 1955) 1955-56 460?; 587? authorized (mid- to late-1950s) 1956-57 475? 1957-58 490? 1958-59 490? 1959-60 520? 1960-61 560? 1961-62 585? 1962-63 587 (March 1963) 1963-64 572 (March 1964) 1964-65 590? 1965-66 590? 1966-67 590? 1967-68 590? 1968-69 600 (March 1969) 1969-70 590? 1970-71 590? 1971-72 590? 1972-73 590? 1973-74 593 (March 1974) 1974-75 593 (March 1975) 1975-76 549 1976-77 598 1977-78 569 1978-79 572; 600? authorized (late 1970s?) 1979-80 597 (July 1979-March 1980 average) 1980-81 603; 645? authorized (early 1981?) 1981-82 624 1982-83 640; 670? authorized (mid-1983?) 1983-84 648 1984-85 666; 720? authorized (mid-1985?) 1985-86 670 1986-87 705 1987-88 727; 900? authorized (mid-1987?) 1988-89 784 1989-90 849 1990-91 896 1991-92 866 1992-93 875 1993-94 875 1994-95 900? 1995-96 900?
 History of CBNRC, Chapter 17, p. 37 and p. 43.
 Statement by Deputy Clerk, Security and Intelligence, to Standing Committee on National Defence and Veterans Affairs, 2 May 1995.
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