USAF grounds KC-135 Stratotanker fleet over concerns their tails may fall off mid-flight

The problem was that instead of keeping the boom operator in the tail end where he can actually see the receiver aircraft with his own eyes, they moved him up onto cargo floor near the cockpit. He has to use cameras and they found that there is a serious problem with depth perception and have had the boom strike several receiver aircraft, nearly punching out a few windshields. So they added a second boomer to watch another screen next to the original boomer to help. Due to this issue, the aircraft is not certified for combat operations. Training ops only. As usual, the military tries relying on high tech in an area where a human can do the job much better. They've only been doing for 70 years.