What innovative product launch strategy did the US Army use when introducing the M1 Garand rifle in 1936 that revolutionized military procurement?

The introduction of new weapons systems has often been accompanied by sophisticated marketing campaigns and product launches. In the world of military history, certain product launches stand out for their innovation, impact, and lasting legacy. This trivia question focuses on one of the most significant small arms introductions in modern military history - the M1 Garand rifle - and how its launch transformed both military tactics and equipment procurement strategies in the mid-20th century.

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Extensive field testing with combat veterans before full production, establishing the modern military field testing protocol
Celebrity endorsements from famous generals, creating the first military influencer marketing campaign
Televised demonstration showing superiority over bolt-action rifles, pioneering military broadcast marketing
Limited edition collector variants for officers, introducing tiered product offerings to military procurement