Beginning in 1939, World War II had a profound effect on Zippo. Upon America’s entry into the war, Zippo ceased production of lighters for consumer markets and dedicated all manufacturing to the U.S. military. The military initiative led to the production of the steel-case Zippo lighter with black crackle finish. The fact that millions of American military personnel carried the lighter into battle was a significant catalyst in establishing Zippo as an icon of America throughout the world. Supplying the military market resulted in full production for the plant. This enabled Zippo to be strong financially and made it a viable company.