There is no "standard" it is all METT-T dependant. M16 bearers are issued 6 magazines, but tend to carry more if needed. SAW gunners are suppose to only have 2 Ammo pouches, but always seem to carry more drums than they have places for and spread load their excess ammo to other within the fire team. Grenadier/fire team leaders are normally the only ones that carry rounds for the M203, but in OOTW since they are a less than lethal platform they also spread load those rounds. The current MOLLE gear only comes with pouches for 2 M67s, so any extra have to be carried somewhere else other than the LBV. AT-4 are carried if the threat warrants it, but that ranges from the riflemen only to everyone carrying one. On top of that it is not unusual to spread out some of the Company's mortar and Machine-gun ammo to everyone other than the radio operator, but the RTOs batteries are sometimes also spread loaded depending on how many he is carrying.