H-53E can be really shocking
The static discharge from the C/MH-53E is very significant. The ground crews use a Sheppard’s hook with a grounding wire to ground the aircraft prior to touching the hook during load hook ups. The system also incorporates a grounding wire from the hook up the pendant providing a path into the airframe. There was at least one instance where the ground wire became detached as the pendant stretched during a 32,000 lb lift. In this case the crewman in the aircraft with his hand on the mechanical hook release was knocked on his butt.