Back in February, the US Army decided to send smart mortars into the hills of Afghanistan, and soon the first precision 120 was fired in anger — where it put a shell within four meters of its intended target.
The Army’s M120 120mm mortar can launch shells 7,000 meters, and those shells have a 70-meter killing radius. Landing within 10 meters (half the time) may not seem necessary, but many targets aren’t in the open.
An ATK rep explains their mini-JDAM: