Eugene Griessel wrote:

Did it ever occur to you that only the USAAF has ever needed such a
thing? Nobody else has aircraft that big and that thirsty to make it
necessary or cost effective. I do suggest that technology pioneered
almost 60 years ago would not be that difficult for any modern
aerospace manufacturer to replicate, if they ever needed to.


The Armee de l'Air, Republic of Singapore Air Force, and Turkish Air Force
also felt the need for such a thing.