The M-2 was the primary infantry fighting vehicle for the US Army intended to replace the Vietnam-era M-113 armoured personnel carrier. It was designed to protect infantry in a high-intensity battlefield from bullets and shrapnel. It wasn’t designed to protect them against mines and improvised explosive devices:
One of the little-known casualties of the Iraq war was the American M-2 Bradley IFV (Infantry Fighting Vehicle). Five years ago, the U.S. Army stopped using the M-2 in combat. By then it was clear that the enemy was intent on using mines and roadside bombs in a big way, and the M-1 tank, Stryker and MRAP vehicles were much better able to handle these blast weapons than the M-2.
This was a hard decision to make, because up until then it was believed that the M-2 could be made competitive with upgrades. For example, the BUSK (Bradley Urban Survival Kit) has been applied to about 600 M-2s. [. . .]
All this added about three tons to the weight of the vehicle. Because of his, a major upgrade of the M-2 was planned, to include a more powerful (800 versus 600 horsepower) engine, a more powerful gun (30 or 40mm) and lighter armor (or protection systems that shoot down anti-tank missiles and RPGs). Improved sensors were planned, plus vidcams to give people inside the vehicle a 360 degree view of what’s outside.) More electronics, including one that would allow variable power, and fuel consumption, from the engine were in the works. More safety features were planned as well, including an improved fire extinguisher system. The new version was not expected to show up until 2012. It did not happen, mainly because there was no way of getting around the M-2’s vulnerability to roadside bombs. The M-1 was too heavy (60 tons) to be hurt by bombs or mines, and Stryker and MRAPs were designed to cope with the close range explosions.
