However, while the 7.62×51mm NATO round became NATO standard, the US was already engaged in research of their own, which ultimately led to the 5.56×45mm NATO cartridge.
Предыдущим стандартным патроном НАТО был 7,62×51 мм, созданный в начале 1950-х годов на основе ружейного патрона .300 Savage.