As one of over 5,300 applicants, and a then-
Canadian Armed Forces Aeronautical Engineer with the rank of captain, he was selected in 1992 for Space Team Canada of the
Canadian Space Agency (CSA). McKay was selected as an alternate after Robert Stewart left the Canadian Space Agency program to accept a position at the
University of Calgary. McKay worked on the
Advanced Space Vision System and the robotic arms for the
International Space Station, nicknamed
Canadarm. The first
Space Shuttle mission to include his work was the Space Vision System support to the
Wake Shield Facility, a free flying payload that was released from
Space Shuttle Discovery on
STS-60. Shortly thereafter, in February 1994, McKay was one of four astronauts who participated in the Canadian Astronaut Program Space Unit Life Simulation (CAPSULS), a 7-day simulated space mission which was preceded by several weeks of intensive training. He was appointed Project Manager for the Canadian Space Vision System and was the Mission Manager for the
STS-85 mission, also Shuttle Discovery. Fellow Canadian
Bjarni Tryggvason flew on STS-85 as a Payload Specialist. In October 1997, McKay left CSA to return to active military service. == Military career ==