On the subject of photos held by the NARA, you can find a ton of their USAAF photos online at
Fold3.com.
Their search function is useful to a point, but I'd recommend simply going through it all image by image... I've found far more groovy stuff that way than by doing searches. You can save images you find to an on-site gallery and, although I haven't used it much, I think you can set up various sub-galleries to organize things. I personally grab stuff when I find it, but the on-site gallery thing is handy if you're in a rush and wanna go back to find something without having to wade through a bazillion images again.
Although a paid membership is required to view much of what they offer, their USAAF photos are free to view and download so long as you register at the site. They also have MACRs, but those are 'premium' documents and you have to have a paid membership to see them.
However, they do offer a 7-day trial during which you have access to everything, and their monthly rate is something like 12 bucks, I think... not too awful bad.
Fade to Black...