"..M4 [light machine gun]..." Say what? Isn't the M4 the standard issue rifle?
It's NPR flack Radditz. You expect her to know weapons? Yes, it's the standard issue carbine.
You catch the bit where the guy did a Rambo and started laying down fire with his carbine and the SAW?
Yes and no. It's is a variant of the M16, but it's not the standard issue rifle, that would be the M16A4, but the M4's are issued to some units. The are a bit handier in the urban battle, and from vehicles.
Calling it a "light machine gun", isn't that far off. It's not what the Army calls it, but then again if you wanted to buy one the BATFE would certainly say it's a machine gun, which it is, and it is prett light. However the actual LMG is the Squad Automatic Weapon. The M240 is the medium machine gun, while the M-2, which has been around since shortly after WW-I, is *the* heavy machine gun. Everything bigger is called a cannon (although technically a cannon must be capable of firing explosive rounds, although not all do so as their primary ammunition.)