https://history.army.mil/html/books/007/7-8-1/index.html
Read online, or download the PDF from CMH (Center of Military History)
Any questions about CMH, I'm here all day.
Thank you. Looks like this bookmarked page will be my friend:
https://history.army.mil/catalog/search.html
https://history.army.mil/html/books/007/7-8-1/CMH_Pub_7-8-1.pdf