Which of these military products, originally developed for WWII, later gained massive civilian popularity through the marketing tagline 'Jeep There's Only One'?

Throughout military history, certain products and innovations have dramatically altered the course of warfare. Some of these items became so iconic they transcended their military origins to become cultural symbols or marketing legends. This trivia question focuses on one such famous product that revolutionized battlefield logistics and later became a household name with a legendary marketing campaign.

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Willys MB Jeep
Hummer H1
Land Rover Series I
Volkswagen Kübelwagen