Which innovative retail strategy was first widely used by the US military during World War II to boost morale among troops stationed overseas?

Throughout history, militaries have created unique products to boost morale, commemorate victories, and build public support. From wartime propaganda posters to collectible medals, military product marketing has evolved significantly. This poll tests your knowledge about how historical military artifacts and memorabilia were marketed and distributed to both soldiers and civilians during major conflicts.

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PX (Post Exchange) exclusive branded merchandise with unit insignias
V-Mail (Victory Mail) merchandise catalogs with home delivery options
A.P.O. (Army Post Office) direct-to-foxhole product distribution system
Military scrip currency redeemable for American consumer products