"The Legion assault rifle has a lengthy and remarkable history in the Martian military. The original Legion was derived from the Terran AR-34 shortly after the First War of Independence, and the design changed iteratively and laterally over the next few years. Legion 4, which entered service in 2292, has only the name in common with Legion 1. The 8.38 x 80mmR cartridge, better known as the .330 Martian Long, gives the assault rifle the ability to penetrate even Level 4 body armor with ease at distances up to 600 meters-though the recoil is so enormous that operation is recommended only with the aid of an exoskeleton."