A CH-53K from Air Test and Evaluation Squadron 21 (HX-21) performs a recovery rigging evaluation of a CH-53K Engineering Development Model without engines, most gearboxes and tail pylon. The test was to validate the specialized rigging and procedures required to safely recover a downed or disabled CH-53K aircraft, a capability that is not yet standardized in the U.S. Navy’s official salvage manuals. U.S. Navy photo.