Complete Army Historical Series book here, "Eyes of the Artillery, The Origins of Modern US Army Aviation In World War II". Eyes of the Artillery is a classic case study of meeting a present necessity with the means at hand:
https://history.army.mil/html/books/070/70-31-1/CMH_Pub_70-31-1.pdf
https://history.army.mil/html/books/070/70-31-1/CMH_Pub_70-31-1.pdf
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