text: Chapter 5
  Figure 5-5. Line-of-flight/clock system
  NaturalAssemblyAids
  5-90. These aids include landmarks or easilyrecognizable terrain features that forces can use as assembly
  aidsor thatpersonnel can orient their movement on.These featuresinclude hills; streamjunctions;clumps
  of woods;or man-made objectslike radio towers, bridges, buildings, crossroads, or railroads. Units cannot
  rely on natural features as the primary assembly aid. The assembly plan must be usable regardless of the
  drop zone. Executing contingency plans en route may require assembly on an alternate drop zone; an
  emergencyexitfromtheaircraftcanplaceparatroopersonanunfamiliardropzone.
  AssemblyEquipment
  5-91. Airborne forces carry visual, audible, or electronic aids to help them assemble. Planners assign
  different colors, sounds, and coded signals to each unit. The unit standard operating procedures
  standardizes assembly aids. However, units can adapt assembly aids to fit specific situations or
  environments. Terrain restrictions and battlefield noise do not restrict the use of the best assembly aids,
  whicharesimpletouse.Unitsusuallyusevisualassemblyaids.Assemblyequipmentmayinclude:
  (cid:122) Visual aids. Visual aids include visible light sources (such as beacons, flashlights, strobe lights,
  or signal mirrors; panels; flags), balloons; infrared lights (such as metascopes, flashlights with
  filters, infrared weapons sights, or starlight scopes); pyrotechnics; and chemical lights. These
  aidsare simple to use and afford positive identificationof assemblyareas. However, the enemy
  can see themas well as friendlypersonnel can. The Stiner aid has a cloth panel with a colored
  letter; that is, HHC=White “H.” They are the same color for night use. (See figure 5-6.) It has
  pocketsforchemicallights;the letterandpockets areonboth sides.It is mountedon a sectional
  aluminumpolethatfitsinto a weaponscase.