The M113 armored personnel carrier is perhaps one of the best-known armored vehicles in the world. Fully-tracked, it has a M2 .50-caliber machine gun, a crew of two, and holds 11 troops.
This vehicle has been sold around the world – and has seen conflict since 1962. That's 55 years of service, and with so many around the world (at least 80,000 were produced), it will be around for a long time and see a lot of future wars.
Russia, though, built its own version of the M113 dubbed the "MT-LB." This vehicle was also tracked, had a crew of two, and could carry 11 people. However the MT-LB was never used for the purpose of carrying troops into combat – that was the job of the BMP and BTR armored fighting vehicles. As such, while the vehicle had a turret, the turret only had a PKM machine gun in it.
That gun is no slouch, but it's only really good against troops in the open. Even jeeps and Humvees can last for a bit when a 7.62mmx54R round is being fired at them.
So, what was the MT-LB used for? Towing artillery, evacuating wounded troops, delivering supplies, and a host of the not-very-glamorous but critically-important missions on a battlefield, without which, the tanks and IFVs would be in a world of hurt.
Like the M113, the baseline chassis of the MT-LB was modified into other roles. The SA-13 Gopher vehicle is based on the MT-LB. So is the 2S1 122mm self-propelled howitzer.
The Russians even developed a version that could fire the AT-6 Spiral anti-tank missile, a laser-guided weapon that is usually used on attack helicopters.
While not produced in the numbers of the M113, the MT-LB has found its way into many battlefields often with countries once aligned with the Soviet Union. Like the M113, it will be a long time before the last MT-LB is retired.