Moore was recruited as a project engineer for Project Mogul in 1947 by New York University geophysicist Athelstan Spilhaus, who headed the Balloon Group within the project. Project Mogul, led by Dr. James Peoples and his assistant Albert P. Crary, made use of Moore's work in materials science allowing the construction of balloons which could better withstand cold temperatures and safely rise to significantly greater altitudes. A balloon that Moore helped launch in New Mexico on June 4, 1947, was later identified as the source of the debris found on the Foster ranch which led to UFO conspiracy theories and claims surrounding the Roswell incident.