In 1955, the US military built a new aircraft test facility here, part of Nellis air base. It is very lonely here and separated, so it is very convenient to build a military base. Area 51 is on the edge of the Groom Lake, so the authorities also call this the Groom Lake facility. But before 1994, the US military always denied the existence of a coalition aircraft, but did not allow flying in forbidden sky and still does not want to disclose information related to this area. .