Which famous military product marketing campaign of the 1940s used the tagline "The bomb that ended the war" and fundamentally altered how military technology was presented to the public?

Throughout military history, certain marketing campaigns and product launches have fundamentally altered the course of warfare and public perception of military technology. These campaigns not only introduced new weaponry but revolutionized how governments promoted their military capabilities. This trivia question focuses on one of the most influential product marketing campaigns in military history that shifted both technological development and public discourse around warfare.

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

The Manhattan Project's atomic bomb campaign following Hiroshima and Nagasaki
Spitfire aircraft promotional campaign during the Battle of Britain
The V-2 rocket introduction by Nazi Germany
The U.S. M1 Garand rifle launch as "The greatest battle implement ever devised"