M324 Self-Propelled Artillery

The M324 Self-Propelled Artillery, known commonly as the "Porcupine", was an artillery piece developed by the UNSC after the Human-Covenant War, as a means to replace the, as it was currently the only vehicle that could offer the abilities of a Self-Propelled Artillery piece that was massed produced by the UNSC. After the war, in 2553, the UNSC placed the SP42 in a support role. This decision required the UNSC to develop a dedicated piece of Self-Propelled Artillery. It was quickly designed and tested, and on August 14, 2554, one hundred were assigned and delivered to the UNSC Infinity for testing purposes.