Which of these military products was initially rejected by soldiers until a rebranding and packaging redesign dramatically increased adoption rates during World War II?

Throughout military history, product design and marketing have played crucial roles in the adoption of new technologies on the battlefield. Some military innovations initially faced resistance until clever packaging, branding, or influencer endorsements changed perceptions. This trivia question explores how product design and marketing strategies helped transform a once-rejected item into an essential piece of military equipment that saved countless lives.

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The M1 helmet, which was only widely accepted after being marketed as the 'Steel Pot' with testimonials from decorated officers
The flak jacket, which gained popularity after being repackaged with a more masculine design and endorsed by air squadron leaders
The sulfa powder packet, which saw widespread use after being rebranded as 'First Aid Sprinkle' and attached directly to soldiers' equipment
The K-ration meal kit, which was redesigned with region-specific contents and soldier-suggested improvements to boost morale