“Considered Top Secret”: The FBI’s 1949 “Vital Installations” Memo and the Green Fireballs

Part 23 of a series reassessing the documentary record behind the 1933 Magenta narrative. TL;DR: The FBI’s 31 January 1949 memo was marked Confidential but reported that Army and Air Force intelligence officers considered the subject “top secret.” San Antonio said it was not investigating; G-2 and OSI were. The reports prompted conferences, searches and Project Twinkle’s camera program. Russian weapons were a hypothesis, not an identification. Copper particles were collected, including in sam...