An infantry fighting vehicle is a vehicle with higher tier weapons and slightly better armour than an Armored Personnel Carrier, but consequently are more expensive. There typical weapons are an Anti-Tank Guided Missile and a autocannon,
The NATO icon for 'Infantry Fighting Vehicles'
sometimes carrying a machinegun also, giving them limited anti-helicopter capabilities, and will make do as ATGM vehicles. A notable exception is BMP-3, in which aside of the usual autocannon and ATGM, it also carries a massive 100mm HE main gun, which makes them extremely deadly against infantry with its very long firing range.
Remember though that despite of this, due to having only at most 3 points of armour, it will still die extremely quick; if not instantly to tanks, RPGs, and any AGMs
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