Hoplitis is right about infantry having more ammmo available than the bare orbats suggest at first sight. Not because regulations allow you to carry only 4 magazines plus 32 to 56 spare rounds in sealed pouches for or total weight of less than 7.45lb
or such, that you rifleman will not take the initiative to lug on some more if it can save your life on the field.
Plus, IRL, mechanized/motorized units tend to store large amounts of ammo (if not actual spare weapons) in their carriers. This is particularly true of AT and ATGM teams some of which have been criticized for carrying incredibly high loadouts in game.
Since the game doesn't allow for stored spare ammo for single units (which would be quite a waste of time IMHO), that farther load has to be reflected in the infantry unit's loadout itself. QED.
