RACHEL, NEVADA - JULY 22: A warning sign is posted at the back gate at the top-secret military installation at the Nevada Test and Training Range known as Area 51 on July 22, 2019 near Rachel, Nevada. A Facebook event entitled, "Storm Area 51, They Can't Stop All of Us," which the author stated was meant as a joke, calls for people to storm the highly classified U.S. Air Force facility on September 20, 2019, to address a conspiracy theory that the U.S. government is conducting tests with space aliens. (Photo by David Becker/Getty Images)
