According to M.W. Cooper, Snowbird is not the actual project to test fly alien crafts, but was established, instead, as a cover for Redlight Project. Several flying saucer type craft were built using conventional technology. They were unveiled to the press and flown in front of the press. The purpose was to explain accidental sightings or disclosure of RED LIGHT as having been the SNOWBIRD craft.
Established in 1972. The mission of PROJECT SNOWBIRD was to test fly a recovered alien craft. The project was ongoing the last time I saw this information.