Editing Mark 2551 Onager

{{Status|Canon}}
{{Weapon infobox
|image=[[File:H4-OnagerMDC-ScanRender.png|300px]]
|name=Mark 2551 Magnetic Accelerator Cannon
|manufacturer=[[Misriah Armory]]
|model=Mk 2551 Portable 
|type=Magnetic Accelerator Cannon (Onager) 
|cost=
|length={{Convert|32.6|m|ft}}{{Ref/Reuse|VIS}}
|width={{Convert|12|m|ft}}{{Ref/Reuse|VIS}}
|height={{Convert|10.4|m|ft}}{{Ref/Reuse|VIS}}
|maxammo=
|ammotype=25cm M6792 HV/FTHPP-AS{{Ref/Book|Id=VIS|H4EVG|Page=75}}
|operation=[[Wikipedia:Coilgun|Electromagnetic linear motor]]
|rate=Single shot
|velocity=High
|optics=
|range=Long
|service=[[Post-Covenant War conflicts]]
|affiliation=[[United Nations Space Command]]
}}

The '''Mark 2551/25cm Portable Magnetic Accelerator Cannon''', also known as the '''Onager''', is an upgraded variant of the [[Mark 2488 Magnetic Accelerator Cannon]] developed by [[Misriah Armory]]. It uses a 25&nbsp;cm ferric-tungsten depleted uranium round that is fired at hypersonic speeds.{{Ref/Reuse|VIS}}

==Usage==
The Mark 2551 is one of over a dozen Onager variants in production, which can be mounted on various [[Human starship|starships]] and [[space station]]s.{{Ref/Book|Enc22|Page=182}} These include:
*{{Class|Infinity|supercarrier}} - 10x Mark 2551 Onagers{{Ref/Book|HWF|Page=42-43}}
*{{Class|Poseidon|light carrier}} - 2x Mark 2551 Onagers{{Ref/Book|Enc22|Page=127}}
*[[Ivanoff Station]] - 16x Mark 2551 Onagers{{Ref/Book|HWF|Page=34-35}}

==Service history==
The UNSC's postwar prototype flagship, {{UNSCShip|Infinity}}, is equipped with a number of Mark 2551 MAC dorsal turrets. During [[Battle of Requiem|the initial battle]] on the [[Forerunner]] [[shield world]] [[Requiem]] in [[2557]], the "MAC network" controlling these turrets was disabled by troops of [[Jul 'Mdama's Covenant]] fighting for the [[Ur-Didact|Didact]], through the use of three jamming devices placed on the ''Infinity''{{'}}s hull. Once these jammers were destroyed by [[John-117]], [[Cortana]] successfully brought the network back online in a few minutes, though a link relating to "EM relays" needed to be manually initiated before they could fire. When they did, they successfuly forced the Didact in his [[Cryptum]] and his allies to retreat. Along with ''Infinity's'' anti-aircraft batteries, the turrets shot down at least two {{Pattern|Zanar|light cruiser}}s.{{Ref/Level|Id=H4L4|H4|Infinity (level)|Infinity}}

[[Office of Naval Intelligence|ONI]]'s [[Ivanoff Station]] near [[Installation 03]] made use of several automated Mk. 2551 Onagers for defense against space debris and later against at least three [[Jul 'Mdama's Covenant faction|Covenant]] {{Pattern|Zanar|light cruiser}}s when the station was [[Raid on Ivanoff Station|attacked]] by Covenant forces under the command of the Didact himself. The station's defenses were reprogramed by [[Cortana]] to give the evacuating personnel covering fire against the attacking Covenant forces. The Onagers shot down multiple approaching Phantoms, though some managed to slip through their defensive fire to land troops on the station.{{Ref/Level|H4|Composer (level)|Composer}}

==Trivia==
*Unlike Mark 2488 Onager, Mark 2551 Onager are seen operated automatically without operating in manual.
*Lasky mention that it takes time to make the defense network around UNSC ''Infinity'' goes online, indicating that when the defense network is offling, the MAC was rendered inoperable.

==Gallery==
{{Linkbox|gallery=yes}}
<gallery>
File:HTMCC H4 Onager Screenshot 1.png|An Onager on the hull of UNSC ''Infinity''.
File:HTMCC H4 Onager Screenshot 2.png|An Onager on the hull of UNSC ''Infinity''.
File:HTMCC H4 Onager Screenshot 3.png|An Onager on the hull of UNSC ''Infinity''.
File:HTMCC H4 Onager Screenshot 4.png|An Onager on the hull of UNSC ''Infinity''.
File:HTMCC H4 Onager Screenshot 5.png|An Onager on the hull of UNSC ''Infinity''.
File:HTMCC H4 Onager Screenshot 6.png|An Onager on the hull of UNSC ''Infinity'' firing at a Cryptum.
File: Mk 2551 Onager.jpg|An Onager firing at a {{Pattern|Zanar|light cruiser}} during the [[Battle of Aktis IV]].
</gallery>

==List of appearances==
*''[[Halo 4]]'' {{1st}}
*''[[Halo: Escalation]]''

==Sources==
{{Ref/Sources}}

{{UNSC heavy weapons}}
[[Category:Magnetic acceleration weapons]]
[[Category:Artillery]]
[[Category:UNSC ground weapons]]