1944 Green Giant Niblet Canned Corn ad
"Step on it, lady, and step on it hard! - that tin can which poured out its nutritional blessings for your family a few minutes ago. There's a flier over Europe who needs its salvaged tin; a soldier who can use its salvaged steel. Wash, de-label and smash the cans which corn, peaches, peas, soup or any other foods come in. Your country needs'em! P.S. The flatter you smash these cans, the less space they take to shipl the more salvage they'll furnish per 'load'. So, smash these cans to help smash that Axis!"