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{{Status|Canon}}
'''Doppler''' was a [[UNSC]] [[Artificial Intelligence]] construct in [[2552]].
{{AI infobox
|name=Doppler
|image=[[File:FoRInvasion - Doppler.png|300px]]
|number=8575
|began=Before [[2552]]
|ended=[[2552]]
|gender=Male programming
|description=
|color=
|affiliation=[[United Nations Space Command]]
|function=Space Dock Quartermaster
|battles=[[Fall of Reach|Battle of Reach]]}}
'''Doppler''' ([[AI serial number]]: '''AI-8575'''), was a [[United Nations Space Command|UNSC]] [[artificial intelligence]]. In [[2552]], he was the Space Dock Quartermaster for [[Gamma Station]] in orbit of [[Reach]].  


==Biography==
[[AI]] number 8575, Doppler was the Space Dock Quartermaster for [[Reach Station Gamma]] above planet [[Reach]]. Shortly before [[The Battle of Reach]] began in 2552, he alerted [[HIGHCOM]] that the prowler ''[[Circumference]]'' did not delete its NAV logs. It is presumed he then destroyed himself.
On August 29, just prior to the [[Fall of Reach]], Doppler hailed the {{UNSCShip|Circumference}} as it approached the station. However, due to security regarding [[Operation: HYPODERMIC]], which the prowler was a part of, Doppler was told by an ONI official to access Office of Naval Intelligence Instruction ONI-Seven-Eta. The data temporarily scrambled Doppler's memory, causing him to forget about the prowler and about the official who tricked him.<ref>'''[[Halo: Fall of Reach - Invasion]]''', ''Issue 1''</ref> The prowler was then isolated from the [[REACH DOC NET]], preventing Doppler from accessing the ship should he discover it again.


As the battle began, though, Doppler discovered Covenant intrusion software that was penetrating the DOC NET, against which his own counter-intrusion measures were ineffective. This software had also discovered the location of the ''Circumference'', the NAV data of which Doppler was unable to delete. The AI sent a distress signal that reached the {{UNSCShip|Pillar of Autumn}} alerting them that the prowler had failed to delete its NAV database as per the [[United Nations Space Command Emergency Priority Order 098831A-1|Cole Protocol]].<ref>'''Halo: The Fall of Reach''', ''page 302''</ref> When the [[SPARTAN-II Program|SPARTAN-II]] team led by [[John-117]] arrived at Reach Station Gamma, they tried to contact Doppler but were unsuccessful, indicating that he had self-destructed in accordance with the Cole Protocol.
[[Category: A.I.]]
 
==Avatar==
Doppler took the appearance of an English scholar, dressed in a red jacket, a bowtie, and spectacles. He may have been named after the Austrian physicist [[Wikipedia:Christian Doppler|Christian Doppler]], who discovered the wave behavior known as the [[Wikipedia:Doppler effect|Doppler effect]].
 
==Gallery==
<gallery>
File:Invasion; Doppler.jpg|Doppler's avatar.
</gallery>
 
==List of appearances==
*''[[Halo: The Fall of Reach]]'' {{1st}}
*''[[Halo: Fall of Reach]]''
**''[[Halo: Fall of Reach - Invasion|Invasion]]''
 
==Sources==
{{Ref/Sources}}
 
{{UNSC AI}}
[[Category:AI characters]]

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