One of the best things about the US government is the way that non-classified reports etc. have to be made available to the public; NASA's history division website is a goldmine of project and organisational histories, most of which are available for download. The USAF histories are a bit harder to find, but many of them are online as well, as are many of the air university press publications.
NASA's historical web stuff is fascinating. Who would have guessed that the only pilot in the world to fly both Concorde & the Tuplolev TU-144 (Condordski) was a NASA test pilot Robert Rivers, and he went to Russia to do this with a broken leg. Remarkable!
One of the best things about the US government is the way that non-classified reports etc. have to be made available to the public; NASA's history division website is a goldmine of project and organisational histories, most of which are available for download. The USAF histories are a bit harder to find, but many of them are online as well, as are many of the air university press publications.