Editing M990 electrothermal-chemical smoothbore cannon
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According with its new operating principle, the M990 breaks legacy munitions compatibility with its predecessor models and fires a much larger 150mm shell, and is capable of firing guided munitions and projected future advances in energetic propellants.{{Ref/Reuse|Universe}} Some of the projected propellant advances are already in service among the fleet of [[ONI Scorpion|select Scorpion variants]] operated by the [[Office of Naval Intelligence]]'s [[ONI Security|security forces]], which use an experimental shell and the latest energetic propellants.{{Ref/Game|H5G|List of REQ cards|REQ Card|Detail=ONI Scorpion Description|Quote=ONI spares no expense with its "security" Scorpions, outfitting them with experimental ammunition using the latest energetic propellants. Advanced Scorpion with heavy armor and upgraded cannon.}}{{Ref/Site|URL=https://www.halowaypoint.com/en-us/news/canon-fodder-a-time-to-give-tanks|Site=Halo Waypoint|Page=Canon Fodder - A Time to Give Tanks|D=14|M=07|Y=2021}} | According with its new operating principle, the M990 breaks legacy munitions compatibility with its predecessor models and fires a much larger 150mm shell, and is capable of firing guided munitions and projected future advances in energetic propellants.{{Ref/Reuse|Universe}} Some of the projected propellant advances are already in service among the fleet of [[ONI Scorpion|select Scorpion variants]] operated by the [[Office of Naval Intelligence]]'s [[ONI Security|security forces]], which use an experimental shell and the latest energetic propellants.{{Ref/Game|H5G|List of REQ cards|REQ Card|Detail=ONI Scorpion Description|Quote=ONI spares no expense with its "security" Scorpions, outfitting them with experimental ammunition using the latest energetic propellants. Advanced Scorpion with heavy armor and upgraded cannon.}}{{Ref/Site|URL=https://www.halowaypoint.com/en-us/news/canon-fodder-a-time-to-give-tanks|Site=Halo Waypoint|Page=Canon Fodder - A Time to Give Tanks|D=14|M=07|Y=2021}} | ||
The [[XM820B4 Scorpion]], an experimental model produced by [[Hannibal Weapon Systems]], uses the M990 ETC gun's hull and structure as a base for the integration of a fast-discharge [[laser]] weapon system. Aesthetically, this weapon has few outward differences than the standard M990, though is functionally a [[directed energy weapon]] rather than a conventional tank gun.{{Ref/Game|H5G|List of REQ cards|REQ Card|Detail= | The [[XM820B4 Scorpion]], an experimental model produced by [[Hannibal Weapon Systems]], uses the M990 ETC gun's hull and structure as a base for the integration of a fast-discharge [[laser]] weapon system. Aesthetically, this weapon has few outward differences than the standard M990, though is functionally a [[directed energy weapon]] rather than a conventional tank gun.{{Ref/Game|H5G|List of REQ cards|REQ Card|Detail=ONI Scorpion Description|Quote=This is but one of Hannibal Weapon Systems' tank test beds fitted with the latest in vehicle-borne directed energy weapons. Advanced Scorpion with heavy armor and fast-discharge laser currently undergoing trials within UNSC Infinity War Games.}}{{Ref/Site|Id=CFClose|URL=https://www.halowaypoint.com/en-us/news/canon-fodder-close-quarters|Site=Halo Waypoint|Page=Canon Fodder - Close Quarters|D=17|M=10|Y=2021}} | ||
The M990 is extremely effective at penetrating heavy armor, including {{Pattern|Kemu|Wraith}} tanks, and even Forerunner weapons such as the [[Z-510 focus turret]]. It is less effective against nimble aerial targets, such as the {{Pattern|D'nomlhe|Banshee}} or the [[Phaeton]], but is still easily capable of penetrating their armor. | The M990 is extremely effective at penetrating heavy armor, including {{Pattern|Kemu|Wraith}} tanks, and even Forerunner weapons such as the [[Z-510 focus turret]]. It is less effective against nimble aerial targets, such as the {{Pattern|D'nomlhe|Banshee}} or the [[Phaeton]], but is still easily capable of penetrating their armor. | ||