Which revolutionary marketing strategy helped the Imperial War Museum in London increase youth visitor engagement by 35% between 2018-2020?

Military museums face unique challenges in attracting visitors and maintaining relevance in the digital age. Effective marketing strategies are crucial for these institutions to educate the public about military history while ensuring financial sustainability. This trivia question explores an innovative marketing approach that revolutionized visitor engagement at one of the world's most renowned military history museums.

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The 'Voices of War' AR app allowing visitors to hear firsthand accounts from veterans through augmented reality exhibits
A partnership with Call of Duty game developers to create accurate historical battle recreations within the museum
The 'Heritage Guardian' loyalty program offering exclusive access to artifact storage facilities and restoration workshops
Virtual reality helmet rentals that place visitors in accurate 3D recreations of famous military campaigns