Among the general U.S. population, a two-day stubble was not uncommon. This changed once the United States declared war on the Central Powers in 1917; military regulations required every soldier provide their own shaving kit, and Gillette's compact kit with disposable blades outsold competitors whose razors required stropping. Gillette marketed their razor by designing a military-only case decorated with U.S. Army and Navy insignia and in 1917 the company sold 1.1 million razors
In 1918, the U.S. military began issuing Gillette shaving kits to every U.S. serviceman. Gillette's sales rose to 3.5 million razors and 32 million blades. As a consequence, millions of servicemen got accustomed to daily shaving using Gillette's razor. After the war, Gillette utilised this in their domestic marketing and used advertising to reinforce the habit acquired during the war.