Project Sign

8 declassified cases mention this

• PDF · 1971CIA-UAP-019, Australian Dept of Defense Scientific and Intel Aspects of the UFO Problem
• PDF · 1949DOE-UAP-D004, Los Alamos Conference on Aerial Phenomena, 1949
• PDF · 1948DOW-UAP-D093, Analysis of Flying Object Incidents in the United States, 1948
• PDF · 1948DOW-UAP-D097, Project Sign Progress Report, 1948
• PDF · 194818_6369445_General_1948_Vol_1
• PDF · 1948341_110448_Records_Relating_to_the_Collection_and_Dissemination_of_Intelligence_1948-1955-TS_CONT_No.2_2-5300-2-5399
• PDF · 194718_100754_ General 1946-7_Vol_2
• PDF65_HS1-834228961_62-HQ-83894_Section_004