The M3 Bombardier is a UNSC Self Propelled Mobile Artillery unit. The M3 boasts incredible accuracy and rate of fire for a artillery system. The M3 utilises a circular loading system which is full automated. Shells can be literally made on the circular loader, by choosing from different charges, warheads and primers. They can be quickly selected, the loaded and fired. When firing standardised shells only, it can fire 1 shell every three seconds, with 3 in 9 seconds and up to 13 in a minute. The barrel is riddled with coolant tubes, delaying over heating by some time, allowing up to an hour of continuous fire. The M3, also known by marines and soldiers as the 'spam', can be made even more deadly through the use of guided munitions, allowing it to get within centimetres of a target.