text: THIS CHAPTER IMPLEMENTS STANAG 3570.
  Chapter 6
  Drop Zones
  The ground unit commander designates the drop zone, usually with the drop zone
  support team leader's (DZSTL's) technical help. The drop zone is where drop aircraft
  deliver personnel and equipment by parachute or free drop. The commander selects a
  DZ location that best supports the tactical plan. In the case of tactical training, the
  commander checks the USAF assault zone availability report (AZAR) to see if an
  approved DZ already exists within the tactical area. If the AZAR does not include a
  DZ in that area, the commander must assess the tactical situation before choosing a
  DZ location.
  SECTION I. SELECTION FACTORS
  The commander uses the drop zone selection factors discussed in this section to analyze the suitability of a
  drop zone.
  AIRDROP AIRSPEEDS
  6-1. The speed of the aircraft (airspeed) determines how long the aircraft will remain over the
  drop zone. Table 6-1 shows airspeeds for rotary-wing aircraft in knots indicated airspeed (KIAS).
  Table 6-2, page 6-2, shows the same thing, but for fixed-wing aircraft, by aircraft type and load.
  Type of Aircraft Airspeeds
  UH-1 Huey 50 to 70 knots (optimum 70 knots)
  UH-60 Blackhawk 65 to 75 knots (optimum 70 knots)
  CH-46 (USMC) 80 to 90 knots
  MH-53 (USAF) 80 to 110 knots (optimum 90 knots)
  CV-22 Osprey (USAF) 80 to 110 knots (optimum 90 knots)
  CH-47 80 to 110 knots (optimum 90 knots)
  CH-46/53 (USMC) 80 to 110 knots (optimum 90 knots)
  CH-54 Skycrane 65 to 75 knots (optimum 70 knots)
  CH/HH3 (USAF) 70 to 90 knots
  MC-130 Combat Talon I and II 70 to 90 knots
  C-130/141/17/5 130 to 135 knots (personnel/door bundles)
  C-7A Caribou 90 to 120 knots
  C-27A (Aeritalia G-222) 125 knots
  C-46 Commando/C-47 Sky Train 104 to 125 knots
  DC-3 (Contract Aircraft) 104 to 125 knots
  CASA-212 90 to 110 knots
  Table 6-1. Airspeeds for rotary-wing aircraft.