Lazy Dog (bomb)
A Lazy Dog (sometimes called a Red Dot Bomb or Yellow Dog Bomb) is a small, unguided kinetic projectile typically about 1.75 inches (44 mm) in length, 0.5 inches (13 mm) in diameter, and weighing about 0.7 ounces (20 g).
The weapons were designed to be dropped from an aircraft. They contained no explosive charge but as they fell they would develop significant kinetic energy making them lethal and able to easily penetrate soft cover such as jungle canopy, several inches of sand or light armor. Lazy Dog munitions were simple and cheap; they could be dropped in huge numbers in a single pass.