I maintain a Facebook page that has over 10,000 US Army Unit Crests listed.
They are by numerical and alphabetical order, just click on photos to the left of page and then click on "see all" on the right middle.
Then just pick an album and view each page, in that folder.. If you click on a page, it will enlarge so you can view better.
I put a book together that has all of them listed in one place.
Hope you enjoy the collection