text: Drop Zones
  Additional Size Requirements
  6-28. For each additional platform on a C-130, add 366 meters (400 yards) to the length of the DZ. For
  each additional platform on a C-17, C-5, or C-141, add 458 meters (500 yards). For multiple aircraft not
  flying in trail formation, add 100 yards to the width of all CARP DZs. From official sunset to sunrise, add
  100 yards to the length and width of all CARP DZs. For SKE formations, increase the width by 400 yards.
  For SKE formation, you need not add the 100 yards when the aircraft are not flying in trail.
  6-29. For C-17s flying in personnel formations, the minimum width for a basic DZ, using center PIs, is
  1,240 yards for two ship elements, or 1,800 yards for three ship elements. When using offset PIs, the
  minimum width is 1,100 yards for two ship elements, and 1,300 yards for three.
  Note: Multiply yards by 0.9144 to convert them to meters; divide meters by the same number to
  convert them to yards.