text: Landing Plan
  Figure 5-4. Movement of personnel to company assembly area
  Line-of-Flight or ClockSystem
  5-89. The line of flight parallels the parachute-landing pattern. This helps each paratrooper establish his
  own landing position relative to those of the other members of their planeload. Leaders use the clock
  system to brief personnel, calling the direction of flight 12 o’clock. (See figure 5-5, page 5-21.) After
  landing, personnel assemble to the right of the drop zone at 3 o’clock or to the left of the drop zone at 9
  o’clock.