Found the old B-52 thread, here:
http://www.pprune.org/military-aircr...ckbushe-6.html
The relevant information is in post #107 : ".... the ATC gents decided to vector them and they followed, knowing they were being put out of position. When they were 2 miles from the approach end 3 miles to the left they were cleared for their "hard right turn to line up"! This obviously was not doable and they flew a safe path. The ATC gents now know a B-52 cannot pull 5 g's to overfly a runway full of spectators. The situation has been resolved and they have made their fly-by's on time and target since. "