Clifford Stone, a retired Army sergeant and speaker at Steven Greer's event, claimed to have catalogued fifty-seven species of aliens, many of which are humanoid and capable of walking among humans unnoticed.

Authors

• Person: Not available Organization: The New Yorker
  How the Pentagon Started Taking U.F.O.s Seriously | The New Yorker

Sources

• How the Pentagon Started Taking U.F.O.s Seriously | The New Yorker www.newyorker.com The New Yorker via serper

Referenced by nodes (1)

• Steven Greer entity