Wow, I didn't know about that. I wonder if a FOIA request could be made.
I recall a post about military satellite images being used to determine the size of the 0's inauguration crowd - seems their ought to also be satellite images of the 9/12 crowd.
Here are pictures of the helicopters that were flying overhead watching the 9/12 March in DC (Where are the pictures they took of the masses?)
http://www.freerepublic.com/focus/f-news/2344103/posts?page=11#11