Historical Note
Preparation for war has the habit of bringing out the best in technological advances. In no case is this more true than in the development of the .30 Ml Carbine and its ammunition, the Carbine Cartridge Caliber .30 Ml.

Until the 1900's, military carbines were merely adaptations of a nation's standard service rifle, featuring a shorter barrel and maybe a slightly modified stock for use by mounted cavalry. It was, of course, chambered for the same cartridge as the service rifle. The last such carbine adopted by the U.S. was the .30-40 Krag-Jorgensen prior to the Spanish-American War.

World War I changed warfare forever. Airplanes, tanks and chemical agents came into prominent use. Submarines, which had been used in a crude form even as early as the Revolutionary War, were now a sophisticated reality, a prelude to the dread U boat wolf packs of World War II. Although horses were still used as draft animals, the cavalry as such was basically a thing of the past. Transport was, so far as possible, mechanized. Machine guns wreaked their deadly havoc on all fronts and toward the end of the war, submachine guns saw service in some areas. With the Allied victory in November 1918, the "war to end all wars " was over. Advanced military thinking in the United States soundly went to sleep, with the exception of a few farsighted individuals like Billy Mitchell, who proved that battleships could be sunk by bombs dropped from airplanes.