One of the most difficult aviation evolutions made more difficult: incredible aerial refueling footage showing the extended refueling probe of the CH-53E move significantly from vibration and the boundary layer passing over it at speed…

https://theaviationist.com/2017/03/03/watch-this-impressive-video-of-midair-refueling-with-a-three-ton-sling-load-in-a-marine-ch-53e-helicopter/