An internet joke to storm Area 51 and "see them aliens" had drawn hundreds of people to the mysterious U.S. government facility. Half a million people signed up to try to enter the military base in Nevada which conspiracy theorists say holds alien technology. The event that took place last week was called Storm Area 51: They Can't Stop All Of Us. Lincoln County Sheriff Kerry Lee said the event was believed to have drawn about 1,500 people to two tiny desert towns close to Homey Airport. He said the attendees were mostly well-behaved. One person was arrested, and another briefly detained, on suspicion of trespassing onto the grounds of Area 51. Two others were arrested for indecent exposure and an alcohol-related incident. More than 150 people got close enough to get a selfie with the gates to the once-secret military base. This is despite U.S. Air Force warnings telling people not to try to enter the Nevada Test and Training Range, where Area 51 is located. "It's public land," the sheriff said. "They're allowed to go to the gate, as long as they don't cross the boundary." The "raid" was more of a small-scale celebration, with enthusiasts dressing up and holding placards.