Soldiers are also trained in several different firing modalities that depend on teamwork. Those 30 rounds aren’t there just because “it’s easier”. I would sooner hand a militiaman a bolt action than a 30 round semi/burst capable weapon. They’d be less likely to blow through significant portions of their ammo load just because the wind made a tree creak. And before you say no, remember the cop that unloaded on his own car because of an acorn. We don’t arm units for their best person, we give them the gun that’s good enough for the lowest common denominator. The 2nd amendment doesn’t make everyone a line Infantryman.