Project Sign was a U.S. Air Force investigation into UFOs conducted by the Air Materiel Command at Wright Field, serving as a precursor to Project Grudge in 1948.

Authors

• Person: Not available Organization: Wikipedia
  Unidentified flying object - Wikipedia

Sources

• Unidentified flying object - Wikipedia en.wikipedia.org Wikipedia via serper

Referenced by nodes (3)

• Air Force entity
• Project Sign concept
• Project Sign event