How was Area 51 used in the Indiana Jones movies?

In "Indiana Jones and the Kingdom of the Crystal Skull," Area 51 is portrayed as a top-secret military base where the U.S. government stores alien artifacts. The film features a climactic scene involving the discovery of a crashed alien spacecraft and the exploration of extraterrestrial themes. Area 51 serves as a backdrop for the film's exploration of Cold War-era paranoia and conspiracy theories, reflecting the blend of adventure and Science Fiction typical of the Indiana Jones franchise.