The MOC has uploaded to their website a listing of all of the flags in their collection including images for most of them. This is a fantastic resource and the wide variety of flags - including some US flags - is amazing!
Here's the link:
http://www.moc.org/site/PageServer?pagename=ce_col_flags
There's 94 pages so be prepared to spend some time on the site. I have sent in a list of some additions and corrections to the War Department flags listed and if you see anything please contact Cathy Wright at: CWright@moc.org
Have fun!
Greg Biggs