The Sulaco crew touches down on LV-426 once contact is lost with the colonists weeks earlier.
  Synthetic White Noise Embedded in Weyland Equipment.  The Sulaco crew on the Surface of LV-426 on July 27, 2179 had the communication issue with their equipment.

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“Despite all the video wizardry the lieutenant could command, none of the individual suit cameras provided a clear picture of what the troops were seeing.”

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July 2179, Aliens novelization, page 142.