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In page 5.56×45mm NATO:

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By late 2004, the 6.8mm Remington SPC (6.8×43mm) was in limited use with U.S. Special Operators.[citation needed] [1]However, it was not adopted for widespread use due to resistance from officials on changing calibers.[1] In 2007, both the U.S. SOCOM and the U.S. Marine Corps decided not to field weapons chambered in 6.8×43mm due to logistical and cost issues.[2]