Courtesy of Shorpy.com
June 1942. "Why greases must be saved. A soldier of the home front -- and there's one in every American kitchen -- saves all waste fats and greases so that they can be processed into ammunition for America's soldiers on the battlefronts. Pan and broiler drippings, deep fats, renderings from bacon rinds: These are some of the fats which should be put through a strainer to remove meat scraps and other solids, and poured into wide-mouthed cans such as coffee or fat cans." 4x5 safety negative by Ann Rosener for the Office of War Information.
And if you don't give your leftover fat to the government, at least make a veggie-filled pastry!