The US Air Force Helicopter Pilots Association has a website here:
http://usafhpa.org/
The Air Force Helicopter training school moved several times and the association has a "history" link if you scroll down their main page.
http://usafhpa.org/schoolhist/histschool.htm
It shows the school at Randolph from June, 1956 to July, 1958.
I did not see any link to old class books on their site, but they may have some information that would help you if you contacted them. They do have a historian listed on their contact page.