I found this photo of a Gi reading a book on this Dutch WWII reenactment website. Their webpage is a nice little history of the book publishing programs for GIs.
I'd love to know where they got the photo, but their site doesn’t have an email address anywhere! I've checked with the National Archives and Library of Congress, but they don’t seem to have any similar photos (at least not any that are easy to find). If they do have some, the photos are probably shelved under a broad term like “GIs relaxing”.