I like what Vonn shared, and anyone who has had to go into the field with a direct impingement M-16 variant. In my little detachment we were able to carry pretty much what we wanted, so there were some other choices. The M-16 was not highly thought of, to say the least. From my own experience, I would hope that there would be, in addition to a standardized battle rife, a pistol caliber (compatible with side arm ammo) carbine weapon, that was compact and possibly in the blow back operating system for certain troop segments, not necessarily with selective rates of fire. I would hope that what ever battle rifle is selected, that it would not be a .223 caliber, and that it would not be a direct impingement operating system. The 7.62X39 round is a tough one to beat in a light infantry contest, especially as someone above suggested-in a much lighter platform, but politics may have a strong influence on that, and any decision. I'll say it again: ask the Vets and the troops.