Armored vehicles, like cars, get a makeover from time to time. Improved versions emerge, often as operational experiences and new technologies are assessed. One big proponent of this iterative process is Russia, which pays special attention to its infantry fighting vehicles and armored personnel carriers.
For instance, let’s look at the BMD series of airborne infantry fighting vehicles. These vehicles are intended to back up paratroopers with some heavy firepower. The original BMD, the BMD-1, was a hybrid between a light tank and an armored personnel carrier. And, just as they did with as the the BMP, the Russians made wholesale improvements to the BMD with each new iteration.
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The BMD-1 featured a 73mm gun and the AT-3 Sagger anti-tank missile as its primary armaments. The BMD-2, however, used a 30mm automatic cannon and either an AT-4 Spigot or AT-5 Spandrel anti-tank missile.
The BMD-2 entered service in the 1980s, and featured a 30mm 2A42 autocannon as its main armament.
(DOD)
Why the shift from a 73mm gun to a 30mm? According to WeaponSystems.net, the reason was that the 73mm gun had… well, performance issues. To be precise, it was simply not as lethal as desired. The 30mm autocannon packed more punch, so it made the cut.
The BMD-2 can hold at least four grunts while packing iits lethal 30mm autocannon and a choice of anti-tank missiles.