A couple image suggestions 

I just saw your request for images at WPDC. I work in DC and can try and get some if you give me the list I will see what I can do. I may take me a while though. I don't get up there very often and its knowwhere near a metro stop. Also,  works at the Library of Congress and might have some ideas and  used to work for the US Army Center of Military History and might have a point of contact of someone who would be willing to look for them there.