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The M45 was able to fire a variety of projectiles in early space faring conflicts. In the early 2400s, the UNSC Marine Corps abandoned the Shotgun as their main-stay poster boy weapon. Instead it was given to less important or, depending on the situation, less visible tasks within boarding parties and police forces. The M45 never truly vanished or has been completely replaced.Eventually it found its way into the hands of the UNSC Army.