The cluster bomb, that is. From Common Dreams. Relevant chunks: “Cluster bombs eject explosive bomblets (little bombs) designed to kill personnel and destroy vehicles over a wide area. Unexploded bomblets can continue killing or maiming civilians long after a conflict has ended, and are very costly to find and remove. In Vietnam, for example, approximately 300 people are still killed annually by unexploded ordnance.”
American-made cluster bombs are currently being used by Saudi Arabia in it’s war on Yemen, a war that has racked up over 3,000 civilian deaths so far. The Saudi’s have spent more than $100 billion since 2010 on US weapons, according to congressional research.