text:  As evening approached , work began to prepare the HLZ 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 HLZ in a NATO " Y " pattern . The entire mission would be conducted with night vision goggles , which required all lights in the embassy compound to be turned off . 
  