The 155mm projectiles are the most widely used artillery round. They offer a wide range of options on the battlefield.
Bursting 155mm Projectiles
M104
H or HD blister gas
M107
HE
M110A1
H or HD blister gas
M116A1
White smoke
M121
GB or VX nerve gas
M549A1
HE rocket assistant
M687
Binary GB nerve gas
M795
HE
M825
White Phosphorus
M122
GB nerve gas
Cargo Carrying
155mm projectiles
M449A1
M483A1
M485A1
Illumination
M692
36 adam M67/M72 submunitions
M718A1
9 M75 land mines
M731
36 adam M67/M72 submunitions
M741A1
9 M75 land mines
M825A1
White Phosphorus
M864
XM867
electronic radio jamming devices
155mm HE Rocket Assistant
The 155mm howitzers are separate loading ammunition, which has four separate components: primer, propellant, projectile, and fuze. The four components are issued separately. Upon preparation for firing, the projectile and propellant are loaded into the howitzer. Separate loading ammunition propellants are issued as a separate unit of issue in sealed canisters to protect the propellant. The amount of propellant to be fired with artillery ammunition is varied by the number of propellant increments. The charge selected is based on the range to the target and the tactical situation.
M67/M72 submunitions
The M712 Copperhead projectile was the first smart artillery round ever developed. Its accuracy is measured in centimeters, and its lethality is impressive. Copperhead is a cannon-launched, 155mm artillery projectile which guides itself to a laser-designated target. The munition is capable of defeating both armor and point targets at ranges of over six kilometers, and provides the battlefield commander with the unparalleled capability of utilizing artillery to the same effect as direct fire weapons and close air support. The system was employed during Operation Desert Storm, during which it met with great success. Copperhead projectiles were used to destroy observation and border guard posts and forward radar installations during the first week of artillery attacks.

The cannon-launched guided projectile (CLGP) M712 (Copperhead) is a 155-mm, separate-loading, laser-guided, HE projectile. It is heavier (137.6 pounds) and longer (54 inches) than the standard 155-mm projectile. The M712 projectile consists of three main sections: a guidance section (forward), warhead section (center), and control section (rear). The guidance section contains the seeker head assembly and the electronics assembly. The nose of the projectile houses a laser seeker in a plastic cone. The warhead section contains an HE antitank warhead consisting of 14.75 pounds of composition B. The control section includes the fins and wings that deploy in flight and allow the round limited maneuverability.

The trajectory of the Copperhead projectile is similar to that of a conventional round. Only when the projectile reaches a point on the descending branch of the trajectory does it differ. At that point, on the basis of the two-digit timer setting included in the fire commands, the guidance and control systems are activated. This enables the projectile to alter the remainder of its trajectory.

At 20 seconds from impact, the laser designator operator begins designating the target. The ground laser operator may use a G/VLLD, a laser target designator (LTD), or modular universal laser equipment (MULE). Airborne systems include the AH-64, OH-58D, and unmanned aerial vehicles. The Copperhead projectile acquires the reflected laser energy and initiates internal guidance and control, allowing it to maneuver to the target.