I was talking with my Nav studes 25 years ago about hardened shelters and their origin as a result of the 6-day war.
Blank looks.
Israeli 6-day war in 1967.
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Israeli air strikes eliminating the Egyptian Air Force.
Blank looks.
These guys had been through Cranditz and only 22 years after that war but had no knowledge that the absolute wipe out of aircraft lined up on the ground led directly to hardened shelters and dispersal plans throughout NATO and the WPC.
Interestingly, Russia did not build shelters on airfields away from the Fronts.