M712 Copperhead projectile

The M712 Copperhead was the first smart artillery projectile ever developed. Its accuracy is measured in centimeters, and its lethality is impressive.
The Copperhead is a 155 mm artillery projectile fired from a gun and guided to a target designated by a laser. This munition can engage both armored and point targets at ranges of more than six kilometers and gives the battlefield commander an unmatched ability to use artillery with the same effect as direct-fire weapons.

The system was used during Operation Desert Storm, where it was highly successful. Copperhead projectiles were used to destroy observation and border posts and forward radar installations during the first week of the artillery bombardment.

The M712 projectile is designed for indirect fire only. However, the projectile's trajectory can be programmed in two modes. In ballistic mode, the projectile flies on a high trajectory. At the apex of the trajectory, the projectile sees the target through the reflected laser beam and steers toward it.
The second mode is the "glide" mode. The glide trajectory is similar to the flight path of a cruise missile. The guidance itself is the same as on the ballistic trajectory.