The U.S. Air Force is warning more than one million people not to try and raid Area 51.

More than one million Facebook users say they want to storm the Nevada military base on September 20th in an effort to "see them aliens."

The page states that the whole thing is a big joke, but the Air Force isn't laughing.

It issued a statement saying "we would discourage anyone from trying to come into the area where we train American Armed Forces."

It went on to say, "the U.S. Air Force always stands ready to protect America and its assets."

Area 51 has been the subject of conspiracy theories for decades.

Many people believe the U.S. government stores its secrets about UFO's and aliens at the military site.