The Groom Lake Base is this confidential military support located 90 miles north of Las Vegas (which is in Nevada). It's in network number 51 of the Nevada Test Site, so it's called Area 51. The United States Air Force Flight Test Center runs the base. It's best known for experimenting exotic aircraft and arms.
The base was formed in 1954 as a place to test the top secret U-2 spy plane that was used to fly missions over the Soviet Union. Then it started to house the SR-71, A-12 and D-21 drone. The F-117A was tested there, also. In the 1980's the base improved in size, all along with the runway (which increased to the present 6 miles). Then, strange lights began to emerge, and armed guards known as the common fellows started patrolling the limit. The government blocked numerous viewpoints from which the Area 51 base might be seen. In 1989, a "physicist" named Bob Lazar claimed that he worked at a base south of Area 51 and also claimed that Area 51 was testing really advanced aircraft and UFO's they got by dealing with the aliens. Since then, Area 51 has been considered as the test core of captured UFOs because of the lights in the night sky.