Corrected entry: As the Russian guards approach the military base, the caption on the screen reads "Nevada, 1957". As they enter the warehouse, you see a "51" on the door but later in the movie Irana refers back to the incident at the military base as taking place in New Mexico, not Area 51 in Nevada.
Correction: She was referring to the UFO crash in Roswell, New Mexico in 1947.
Grumpy Scot