 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 . 
 As evening approached , work began to prepare the HLZ for the main evacuation . The area was used as a parking lot and several vehicles <a href='uninflect' title='1'><mark>were</mark></a> left without keys by staff <a href='null_relcl' title='2'><mark>that</mark></a><a href='been_done' title='3'><mark>had</mark></a> already been evacuated . Some cars had to be broken into to be moved . Chemical lights <a href='uninflect' title='4'><mark>were</mark></a> 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 . 
As evening approached , work began to prepare da HLZ for the main evacuation . Tdaarea was used as a parking lot and several vehicles was left w/o keys by staff done already been evacuated . sum cars had to b broken into to bbmoved . Chemical lights was placed in thdaLZ in a NATO " Y " pattern . The entire mission would be conducted with night vision goggles , which required all lights in thedabassy compound to be turned offf .