I was filing some material at work today, and ran across this image of Donald Duck.
There's two other uses of the same image in the book that can be seen on the Flickr site. The caption for this one is:
Disney's Donald Duck "Mob 8 Insignia" page 160 of The Story of U.S. Naval Mobile Hospital Number 8 by CAPT. William H.H. Turville, NY: Robert W. Kelly Publishing Corp, ca. 1946.
From BUMED's Navy Medicine Historical Files Collection - Facilities - Base Hospitals. 12-0185-003