The National Museum of Health and Medicine, from whence I draw a paycheck, has been putting pictures up on Flickr. Today one of the other archivists put up some shots she took of the Comeback, the post-WW1 Walter Reed Army Hospital Paper. So here are links to a semi-editorial cartoon,
a sports comic strip
and an ad
Larger versions can be downloaded from the Flickr site - there are no download limits.
You can also see this somewhat out of date finding aid, Cartoons and Comics in the National Museum of Health and Medicine.