The Economist reports on how smart bombs are changing warfare:
During the first Gulf war, in 1991, American warplanes had to drop an average of six 450kg satellite-guided bombs to destroy a tank or a small building. During the second war, 12 years later, a similar attack required bombs half that size, and fewer of them. Today 100kg bombs would suffice, because guidance systems are so good that individual rooms, as opposed to entire buildings, can be aimed at.
[...]
One defence contractor, Israel Military Industries, makes a 225kg bomb, the MPR-500, that can hammer through several storeys of a building and explode on a chosen floor. This feat means triggering the detonation about two milliseconds after the bomb hits the ceiling above the doomed storey. The bomb can be programmed to do this just seconds before it is dropped. Such precision means it is sold as a replacement for ordnance two or more times its size.
The CBU-105 is the kind of hardware war nerds love:
On April 2nd 2003, during the second Gulf war, a hundred or so Iraqi armoured vehicles approached a far smaller American reconnaissance unit south of Baghdad. Responding to a call for help, a B-52 bomber attacked the first 30 or so vehicles in the column with a single, historic pass. It dropped two new CBU-105 bombs, and the result shocked the soldiers of both sides — and, soon enough, military observers everywhere.While falling, the CBU-105 bombs popped open, each releasing ten submunitions which were slowed by parachutes. Each of these used mini rockets to spin and eject outward four discs the size of ice-hockey pucks.
The 80 free-falling discs from the pair of bombs then scanned the ground with lasers and heat-detecting infra-red sensors to locate armoured vehicles. Those discs that identified a target exploded dozens of metres up. The blast propelled a tangerine-sized slug of copper down into the target, destroying it with the impact and the accompanying shrapnel. The soldiers in the 70 vehicles farther back in the column surrendered immediately.
The CBU-105, however frightening, may actually point the way toward less violent warfare. Cluster munitions — which release bomblets to cover a wide area — are banned or tightly restricted by an international convention. But the CBU-105 and its cousins, known as sensor-fused weapons, are considered legal because very few discs remain unexploded on the battlefield. Those that fail to detect a target are supposed to self-destruct in the air. The trigger batteries of those that do not will quickly die, so duds are unlikely to kill civilians later.
Crucially, the manufacturer of the CBU-105, Textron Defense Systems, of Wilmington, Massachusetts, is improving sensors to allow the weapon to distinguish the heat signatures of cars, buses and homes from those of military hardware. If there is such a thing as a humanitarian bomb, this might be it.
I’m not sure what role that plays in counter-insurgencency, but it sure is a whiz-bang gizmo. Emphasis on the bang, I suppose.