 As evening approached , work began to prepare the <unk> for the main evacuation . The area was used as a parking lot and several vehicles were left without keys by staff that had already been evacuated . Some cars had to be broken into to be moved . Chemical lights were placed in the <unk> in a NATO " Y " pattern . The entire mission would be conducted with night vision <unk> , which required all lights in the embassy compound to be turned off . 
