Continuing on this series of videos supporting the WW2 Channel, this is part one of a two-part look at how the US Army ended up with the armored force with which it entered combat in North Africa.
Sources include:
Forging the Thunderbolt (Gillie)
Men on Iron Ponies (Morton)
Greasy Automatons and the Horsey Set (Tedesco)
A number of Center of Military History documents to include
A few other things I've forgotten about, but the above will get you 90% of the way there.
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Christie Tank Video
https://www.youtube.com/watch?v=0APcEvupuiA
1930 Cavalry Journal.
https://mcoepublic.blob.core.usgovcloudapi.net/library/CavalryArmorJournal/1930s/1930Apr_Jul_Oct.pdf
1939 Cavalry Journal
https://mcoepublic.blob.core.usgovcloudapi.net/library/CavalryArmorJournal/1930s/1939Jul-Dec.pdf
Soviet doctrine video.
https://www.youtube.com/watch?v=s7nr83CYQ9Q
Interview with Ken Estes on USMC tank history
https://www.youtube.com/watch?v=_DBmNuyvfSw
Assessment of USMC light tanks.
https://www.youtube.com/watch?v=gy4dwUnF3VQ