The origins of the Canadian upper atmosphere and space program can be traced back to the end of the Second World War. Between 1945 and 1960, Canada undertook a number of small launcher and satellite projects under the aegis of defence research, including the development of the Black Brant rocket as well as series of advanced studies examining both orbital rendezvous and re-entry. In 1957, scientists and engineers at the Canadian Defence Research Telecommunications Establishment (DRTE) under the leadership of John H. Chapman embarked on a project initially known simply as S-27 or the Topside Sounder Project. This work would soon lead to the development of Canada's first satellite known as Alouette 1.