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| {{Ratings}}
| | #REDIRECT [[Machine-linked autocannon]] |
| {{Era|HCW}}
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| <center>''Were you looking for the [[AAA Helix Gun]]?''</center>
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| {{Weapon
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| |image=[[File:Point Defence Gun.jpg|300px]]
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| |name=M9109 ASW/AC 50mm MLA
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| |manufacturer=
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| |model=
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| |type=
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| |cost=
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| |size=
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| |damage per hit=
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| |magazine= Blocks<ref name="Everest"/>
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| |maxammo=
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| |fire=
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| |ammotype= 50mm high-explosive
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| |operation= Computer/AI operated<ref name="nav">'''Halo: The Fall of Reach''', ''page 19''</ref>
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| |rate of fire=
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| |accuracy=
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| |range=
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| |era=26th Century<ref name="Everest">'''[[Halo: Evolutions - Essential Tales of the Halo Universe]]''' - ''[[The Impossible Life and the Possible Death of Preston J. Cole]]'', ''page 475''</ref>
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| |counterpart=[[Pulse Laser Turret|Covenant Pulse Laser Turret]]
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| |counterwep=
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| |affiliation=[[UNSC]]
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| }}
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| A '''M9109 ASW/AC 50mm MLA''',<ref>'''[[Halo: Reach]]''' - ''Game Manual''</ref> also known as the '''Point Defence Guns''' is a [[United Nations Space Command]] starship-mounted weapon that fires 50mm high-explosive projectiles.<ref name="Flood215">'''[[Halo: The Flood]]''', ''page 215''</ref>
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| ==Design details==
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| ===Functionality===
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| The M9109 functions much like the [[wikipedia:CIWS|CIWS]] designs created during the 20th Century, firing 50mm projectiles. Unlike [[Archer missiles]] and the [[Magnetic Accelerator Cannon|MAC]] weapon systems mounted on capital ships, the Point-Defense Guns are ''not'' used to engage Covenant capital ships, instead meant to intercept smaller threats like [[Seraph]] fighters<ref>'''[[Halo: The Fall of Reach]]''', ''page 272''</ref> or boarding craft to prevent (or at least lessen) the damage inflicted to a warship.
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| Because [[human]] operators lack the reflexive responses necessary to operate the point-defense guns to maximum effect, the autocannons are computer controlled and, if an AI is available, control is diverted to it. "Smart" AI's seem better able to operate the Point-Defense Guns than standard computers and also lesser "dumb" AI's.<ref name="nav"/>
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| ===Operational history===
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| During the human occupation of [[Installation 04]], the ODSTs that recaptured and secured the wreckage of the {{UNSCShip|Pillar of Autumn}} from the [[Covenant Empire|Covenant]] managed to scavenge<ref>'''Halo: The Flood''', ''page 137''</ref> several dual barreled<ref name="Flood215"/> 50mm turrets. The ODSTs utilised the scavenged defense weapons and used them as anti-air defensive emplacements at [[Alpha Base (Installation 04)|Alpha Base]]. The [[GA-TL1 Longsword-class Interceptor]] is also equipped with these turrets, used in an air-to-surface combat capacity during tactical strikes.<ref>'''[[Halo: Reach]]''' - ''Game Manual''</ref>
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| ==Gallery==
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| <gallery widths="150">
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| File:Origins - Defensive Measure.png|A [[Halcyon-class cruiser]] defending itself form the Covenant boarding crafts using its point defense guns.
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| File:UNSC Savannah.jpg|The {{UNSCShip|Savannah}} using its point-defense guns against the [[Ardent Prayer]] in [[Operation: UPPERCUT]].
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| </gallery>
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| ==Sources==
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| <references/>
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| {{UNSC Heavy Weapons}}
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| [[Category:Weapons]]
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| [[Category:UNSC technology]]
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