Many of the amateur researchers or those who just interested in history doesn’t know that there’s a plenty of possibilities to acquire a book, thesis, manual or even an actual document regarding the object of interest.
As to an US Air Force there’s a few main stops where listed items could be found online. I’ll try and list it here.
It’s a good places to begin. The same goes for Army, Navy and Marine Corps – they have similar libraries which allow to read books online. And believe me, all these libraries and collections of magazines back issues are worthy.