Finding:

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   Barney Calhoun

   Whilst Barney Calhoun is the name of a specific character in the Half-Life story, the name "Barney" also applies to the Black Mesa security officers in general.
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   Half-Life: Blue Shift

   The player assumes the role of Barney Calhoun, a security guard working near the labs where the accident takes place. ... After eventually being let in and reporting for duty, Calhoun is instructed to assist in maintenance on a malfunctioning elevator nearby.
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   Gordon Freeman

   He soon meets up with Barney Calhoun and Alyx Vance, and joins the resistance against the Combine. ... The vortigaunts are able to heal her, but doing so requires Gordon to assist one of the vortigaunts to acquire some antlion larval extract.
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   City 17

   Three rooms are located across the chamber which are specifically designed to help stabilize the core in the event that its energy output becomes unstable. ... Gordon eventually reaches the foot of the Citadel, with the aid of Barney and Alyx's robot pet Dog, and enters the structure to rescue Eli and Alyx and to confront Doctor Breen.
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   Black Mesa Research Facility

   It is first seen by Barney Calhoun when he escapes from Sector C. ... At the end of Opposing Force, the G-Man, having captured and restrained Shephard, states that "the embarrassment" that is Black Mesa Facility will "take care of itself", at which point a flash of white light is seen, signaling the nuclear destruction of the research facility.
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   List of Combine non-combat technology in Half-Life 2

   Three rooms are located across the chamber which are specifically designed to help stabilize the core in the event that its energy output becomes unstable. ... Gordon Freeman · Adrian Shephard · Barney Calhoun · Doctor Gina Cross · Doctor Colette Green · Chell
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   Alyx Vance

   Barney Calhoun additionally mentions that Freeman is a "lucky dog" to travel alongside Alyx. ... As long as the player does not deliberately avoid helping Alyx, it is difficult for her to be killed.
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   The Resistance (Half-Life 2)

   If Barney Calhoun can be taken as an example, some seem to act undercover within Combine ranks. ... Examples are, in "Exit 17", where, if the NPCs "sense" they are in danger, they will angrily remark on Freeman's inability to help them (saying things like "I thought you are supposed to protect us!").
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   List of Half-Life universe characters

   Barney Calhoun ... He is then encountered during the player's return to City 17, where he is fighting in the uprising against the Combine, and mostly aids in shutting down the suppression field.
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    Concerned

    He exemplified the presence of various objects throughout the levels of games, which were intended to aid the player, but would have little chance of being found in the real world in a similar manner. ... Doctor Gordon Freeman · Corporal Adrian Shephard · Barney Calhoun · Doctor Gina Cross · Doctor Colette Green · Chell

Explore the following pages on Powerset:

• Barney Calhoun,
• Half-Life: Blue Shift,
• Gordon Freeman,
• City 17,
• Black Mesa Research Facility,
• List of Combine non-combat technology in Half-Life 2,
• Alyx Vance,
• The Resistance (Half-Life 2),
• List of Half-Life universe characters,
• Concerned