Which product innovation during WWII involved deliberately adding a specific weakness to armor plating, revolutionizing survivability rates for Allied aircraft?

Throughout military history, product innovation has dramatically shaped warfare outcomes. From gunpowder to radar systems, technological advances have defined military superiority across centuries. This trivia explores a fascinating example of how product design innovation during WWII created an unexpected advantage that saved countless lives and influenced modern military equipment design philosophy. Test your knowledge about this lesser-known but significant military product innovation!

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Self-sealing fuel tanks that could repair small punctures
Deliberately vulnerable armor sections that channeled damage away from critical components and crew
Lightweight aluminum panels that would detach upon impact to dissipate energy
Modular wing sections that could continue flying even when partially destroyed