text: Drop Zones
  PERSONNEL BUFFER ZONE
  6-121. There is a minimum buffer of 300 yards on the lead, left, and right sides of the DZ, and minimum
  buffer of 200 yards on the trail edge of the DZ.
  MARKERS
  6-122. Markers differ for day and night.
  Day Operations
  6-123. For day operations (Figure 6-15), pathfinders mark the point of impact with a RAM (Figure 6-5,
  page 6-20) and an Air Force code letter (optional), which could be a "J," "C," "A," "R," or "S"
  (Figure 6-16). This applies to rectangular drop zones. They use "H" or "O" for circular drop zones. Each
  letter must measure at least 35-feet square, and requires at least nine panels flat on the ground.
  Figure 6-15. Drop zone placement (day).