https://twitter.com/MichaelNeiberg/status/1087103601430925314?s=17

Michael Neiberg (@MichaelNeiberg) Tweeted:

Just came across this amazing memo from Lin Wells to Rumsfeld in April 2001 on difficulty of prediction. Incredible #history #FWW #WWI #SWW #WW2 #ColdWar. I can’t believe I had never seen this before. https://t.co/uMIffbMFMz

(Then came 9/11.)