Which of these famous military products was originally rejected by the US Army, only to become one of the most produced American military vehicles of WWII after a legendary demonstration?

Throughout military history, certain products and innovations have dramatically altered the landscape of warfare. These revolutionary items often came from unique collaborations between military needs and industrial ingenuity. This trivia question explores one such famous product that significantly impacted World War II operations and whose design principles continue to influence military equipment today.

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The Willys-Overland Jeep, which proved its worth by climbing the steps of the United States Capitol Building
The Boeing B-17 Flying Fortress, which completed a non-stop transcontinental flight to demonstrate its reliability
The M4 Sherman Tank, which demonstrated superior maneuverability by crossing a specially designed obstacle course
The Walkie-Talkie SCR-300 radio, which maintained clear communication during a simulated battlefield environment test