During WW II, U.S. Secretary of the Treasury Henry Morgenthau, Jr. planned a national defense bond program in the fall of 1940. The intent was to unite the attractiveness of the baby bonds that had been implemented in the interwar period with the patriotic element of the Liberty Bonds from WW I.
The Treasury began marketing the previously successful baby bonds as "defense bonds". Three new series of bond notes, Series E, F and G, would be introduced, of which Series E would be targeted at individuals as "defense bonds".
George H. LaBarre Galleries - Collectible Old Stocks and Bonds and Old Stocks and Bonds
http://www.glabarre.com/ A foreign antique stock and bond company.