Jack O'Brien

O'Brien
Full Name	Jack O'Brien
Title	'Captain' (self-proclaimed) Corporal
Design
Armor Set	CQB Mark VI (shoulder pads)
Armor Color	Cyan (with rubine trim)
Weapons	Battle Rifle Magnum
Profession
Occupation	Head Guard
Affiliation	UNSC SAFE Program
Personal Info
Species	Human
Pronouns	He/Him
Status	Deceased
Official Info
First Appearance	Machine
Voice Actor	Blankslate

Corporal Jack O'Brien was a soldier stationed on Outpost High Ground, voiced by Blankslate_GG. He claimed to be the head guard of his outpost upon Cayde Jasper's disappearance.

Personality

O'Brien is unserious and does not care about his coworkers, especially Linda Kelen.

Role in Plot

Events of Season 1

At the end of Machine, O'Brien dismisses the claims by Frank Collins that the latter saw a warthog on the beach of Outpost High Ground. Linda Kelen criticizes O'Brien for supposedly changing his armor to a captain's uniform in the absence of Cayde Jasper, but O'Brien dismisses this as well while Collins and Diego Jones agree with him and insisting he had always been captain.

His dead body is later seen during Overture, presumably killed by members of The Damned after eliminated Jasper earlier.

Classic

O'Brien's role in Classic

Immediately after switching seats with Collins after Major Malfunction: Episode 3, in the opening flashback of Ambush, O'Brien and Kelen are both shot in the head by a plasma blast. Later, in Deception, Spartan Louie Vargas and five repurposed protocol robots investigate the attack and discover O'Brien and Kelen's dead bodies before Louie is shot and killed in a similar manner. }} Gallery O'Brien with his main look during WarGames O'Brien with the EVA helmet, Recon chest plate, and Security shoulder pads in the prologue to Major Malfunction O'Brien with the EOD helmet, Recon chest plate, and Security shoulder pads in the first episode of Major Malfunction O'Brien with the Recon helmet/chest plate and Security shoulder pads in the second episode of Major Malfunction O'Brien with the CQB helmet, Recon chest plate, and Security shoulder pads in the third episode of Major Malfunction Appearances Appearances for O'Brien Season 1 Machine (debut) Overture (corpse only) WarGames Deception (corpse only) Ambush (flashback) Major Malfunction (debut) Trivia A running gag throughout Major Malfunction was that he would switch his helmet but only his teammate Linda Kelen would notice. This gag would returns in Machine, in which O'Brien adopts the armor and rank of his former captain with only Kelen taking notice. His armor in WarGames differs from his armor in Major Malfunction, as in the latter he consistently wears a Recon chest plate with Security shoulder pads while rotating through various different helmets while in the former he appears with the CQB chest plate and Mark VI shoulder pads. This was due to series creator Syp The Mighty's desire for O'Brien to match the other head guards in Guard Duty, who have the CQB helmet/chest plate with Mark VI shoulder pads. His secondary color was also changed, originally maroon in Major Malfunction before being changed to rubine for WarGames. This was simply due to Syp misremembering the color. He was voiced by Chron Aldazaar in Major Malfunction before Blankslate was cast for WarGames and beyond. His first name is never stated in-series, with Syp coming up with it after the release of WarGames. During the production of Major Malfunction, its creators considered his full name to be Phillip O'Brian, with the spelling of his last name changing by the time WarGames was produced. It is heavily implied in Machine that O'Brien is not actually the rank of captain, simply adopting it in light of Jasper's absence. Guard Duty Characters Black Out Guards Geff Rodrigo • Sarah Daws • Nicole Vega • June Vega • Mitchell Miller SAFE Program Ignacio Dominguez • Randy DeLuca • Eleanor Winkler • Felicity Benes • Dick Bosko • Alana Reynolds • Louie Vargas • Damien Wilson • System Operator • Robot • Red • Yellow • Blue • Pink • Green UNSC Brigadier • Valentine • Denise Rocko Trinity Pathfinder • Forge • Robert Balboa High Ground Guards Cayde Jasper • Jack O'Brien • Linda Kelen • Frank Collins • Diego Jones Pit Fall Guards Rico Suave • Percy O'Hara • Dino Jones Rat's Nest Guards Jace Casper The Damned Corvus • Riel • Kazi • Fazeka Other Emery Eden • Prim • Molotov • Cocktail