text: Chapter 5
  Figure 5-19. Grounding technique.
  y Once the static wand man grounds the aircraft, the other hookup man places the apex fitting
  onto the cargo hook, then checks to make sure that the hook is properly closed (and locked, if
  required).
  y After you properly hook up the load to the aircraft, both of you must move quickly aside to the
  location coordinated with the aviation unit. If the signalman learns that any of the legs have
  fouled, he notifies the pilot at once. Also, you will have to rehook the load.
  RELEASE PROCEDURES
  5-90. For this mission, leaders refer to the hookup men as the "cargo release team." As the helicopter
  approaches the site, the pilot takes instructions from the signalman, who guides the aircraft into position for
  cargo release. The cargo release team stands by, unless it must release the load manually. The signalman
  directs the aircraft to set the load on the ground. He gives the release signal. At this time, the apex fitting
  should fall free of the cargo hook. If it does not, the signalman has the aircraft hover, then he directs the
  cargo-release team to move under the helicopter and manually release the load from the hook. The load
  clears the hook. After the release, everyone moves out from under the aircraft. The signalman directs the
  aircraft to depart and quickly moves out of its path. If the pilot cannot activate the cargo hook from within
  the helicopter, and if cargo release personnel open it, then ground-crew members must use the following
  emergency cargo release procedures: