Kathryn S. Olmsted (11 tháng 3 năm 2009). Real Enemies: Conspiracy Theories and American Democracy, World War I to 9/11. Oxford University Press. tr. 184. ISBN978-0-19-975395-6. Olmsted writes "When one of these balloons smashed into the sands of the New Mexico ranch, the military decided to hide the project's real purpose." The Official Air Force report (Weaver & McAndrew 1995) had concluded (p. 9) "[...] the material recovered near Roswell was consistent with a balloon device and most likely from one of the MOGUL balloons that had not been previously recovered."
