[eaglesiniowa]

I am sure there are bigger weapons in overwatch. From the looks of this picture, they are certainly not overmatched.

[Blood of Tyrants]

The problem is that the distances involved in Afghanistan are often outside the effective range of the M-4. They need a round that has more punch beyond 250 yards. Since we already have 7.62 NATO round for machine guns, and there are several battle proven rifle designs available.

[2sheds]

IIRC, the pictures were taken at the start of ops outside Marjah a couple weeks ago. The original caption was something like "Marines with Afghan man and child under fire outside Marjah". God bless our soldiers!