You cannot hide.

[Surpmil]

As far as bombs are concerned I would have though Tallboy and Grand Slam were the start of it all.

The GBU-28 was apparently needed either because those lessons of WWII had been forgotten, or more likely because in peace-time (relative term) no one was interested in being involved in such a low-budget, low-tech project; your future employers in the MIC would not be impressed!

They don't explain in the video why it was decided not to use B52s for delivery, but presumably vulnerability to SAM's or low approach speed allowing target deduction by the Iraqis(?)

And of course no reference to the Barnes Wallis bombs or their supersonic rates of descent. Things would have gone quite differently if a guidance system had been provided for Tallboy and Grand Slam.