The 6.8 is NOT intended to replace the 5.56mm NATO as our standard infantry round. (Even if it SHOULD!!) It is intended, at least at this time, as a special purpose round to be issued to special operations forces, not every GI who needs a rifle. Indeed, there are a lot of influential military folks who have yet to be convinced of the need for this round, which is going to at least cause a little more confusion for the logisticians (many of whom are plenty confused enough already!!)