Infantry support vehicles, Just as Vehicles support Infantry Infantry can see Issues and threats the vehicles cant but your nor going to have Grunts walking alongside the Vehicles for a entire Armored high speed thrust.
Exactly! The whole point of having troops alongside vehicles is to spot and take care of issues that cannot be taken care of with people inside the vehicles. If everyone can simply sit comfortably inside vehicles, what's the point of having infantry supporting an armored column???
And as Engineer mentioned, those soldiers sitting inside a vehicle have to come out eventually to execute their mission, i.e. attacking someone/something, taking down a building, rescuing hostages, etc. They can't do any of these while sitting inside a vehicle, can they??? So simply spotting them outside of a vehicle does snot mean that they have been walking the past 200 miles alongside vehicles...