The cartridge and the M1 Carbine, not to be confused with the M1 Thompson submachine gun or M1 Garand rifle, were developed to give rear area units more firepower than the standard issue M1911A1 .45 caliber handgun. Tankers, drivers, artillery crews, mortar crews, and other rearline personnel were issued the M1 Carbine in lieu of the larger, heavier M1 Garand. The .30 Carbine falls roughly between modern day .38 Specials and .357 Magnums in terms of power, and the caliber is ballistically much closer to a pistol than to a rifle.
Despite its mission of being a cross between a sidearm and a full length rifle to be used by support units, many infantymen, particularly Marines fighting in the Pacific jungles, preferred the weapon over the M1 Garand because of the weapon's small size and weight. Also, at the ranges they were fighting at, the power of the M1 Garand was not needed and the length and weight made a full-sized rifle somewhat cumbersome.
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