Originally developed in AC 195 as a replacement for the aging OZ-06MS Leo, the OZ-17MS Serpent's production lines at the X-18999 space colony were seized by the Barton Foundation following that year's military and political strife. The Barton Foundation then began production of 500 Serpent units (now re-designated MMS-01) for its puppet military force, the Mariemaia Army. Intent on using the Mariemaia Army's force against the now de-militarized Earth Sphere United Nation, the Barton Foundation intended to follow through with its original plans to seize control of the Earth Sphere.
The MMS-01 Serpent, like its Leo predecessor, was a versatile mobile suit capable of being equipped for both space and land combat. Built of the new-and-improved neo-titanium alloy, the Serpent was physically almost as tough as the gundanium-armored Gundams, but much less expensive to produce. Armed with shoulder missile launchers, the Serpent could also carry a variety of hand-carried weapons, such as a bazooka, a large beam cannon or a double-barreled Gatling gun similar to that carried by the XXXG-01H2 Gundam Heavyarms Kai. Since the Earth Sphere United Nation had scrapped all of its military weapons - including mobile suits - the Serpent was not armed with any hand-to-hand combat weapons.
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