Which World War II military product innovation was specifically designed to conserve resources and later became a significant civilian sustainability advancement?

Test your knowledge about sustainability initiatives in military product design throughout history. Many military innovations have later been adapted for civilian use, and some were developed with resource conservation in mind even before 'sustainability' became a modern concept. This poll explores how military product designers have addressed resource scarcity and environmental concerns through the ages.

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Jerrican (German military fuel container)
M1 Helmet (Steel pot)
P-51 Mustang Fighter (Laminar flow wing)
M1 Garand Rifle (En-bloc clip loading system)