Finding:

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   Barney Calhoun

   Barney was joined by his co-worker Otis (named after another character from The Andy Griffith Show); both Barney and Otis helped Adrian Shephard, the protagonist of Opposing Force, in much the same way that Barney had helped Gordon Freeman in the original game, such as opening authorized access doors and killing some enemies along the game. ... | Barney Calhoun |
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   Half-Life: Blue Shift

   | The box art for Blue Shift, depicting protagonist Barney Calhoun |
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   Black Mesa Research Facility

   The duty rotation of Barney Calhoun (the protagonist in Blue Shift) is printed in French, suggesting that the facility has a recruitment process with international scope. ... It remained unclear whether or not the actions of the Lambda team, in particular their launching of the satellite, actually helped to close the dimensional rifts.
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   List of Half-Life universe characters

   Gordon Freeman, Ph.D, is the silent protagonist of the Half-Life series, and the playable character in Half-Life, and all games in the Half-Life 2 series. ... Barney Calhoun
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   Gordon Freeman

   He soon meets up with Barney Calhoun and Alyx Vance, and joins the resistance against the Combine. ... In these appearances, Gordon maintains his silence, even though he is not the protagonist.
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   Locations in the Half-Life series

   In Half-Life, protagonist Gordon Freeman is introduced to the facility in a notable sequence involving very little interactivity. ... Blue Shift shows the events from the viewpoint of a security guard, Barney Calhoun, who joins a group of scientists who use the teleportation technology to evacuate survivors from the base.
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   City 17

   City 17 is first introduced to Gordon Freeman (the protagonist of Half-Life 2) by the G-Man. Gordon is brought into the new world without knowing what has happened in the previous years after the Black Mesa incident and starting work under the G-Man. ... Thanks to the efforts of Gordon and Barney Calhoun, the last of the city's citizens were evacuated via train.
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   List of Yale University people

   John C. Calhoun (B.A. 1804), Seventh Vice President of the United States, for two different presidents, John Quincy Adams and Andrew Jackson; Senator; Member of the House of Representatives; Secretary of State in the Tyler presidential administration ... Matthew Barney (B.A. 1989), video and installation artist
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   Alyx Vance

   Barney Calhoun additionally mentions that Freeman is a "lucky dog" to travel alongside Alyx.
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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.

Explore the following pages on Powerset:

• Barney Calhoun,
• Half-Life: Blue Shift,
• Black Mesa Research Facility,
• List of Half-Life universe characters,
• Gordon Freeman,
• Locations in the Half-Life series,
• City 17,
• List of Yale University people,
• Alyx Vance,
• The Resistance (Half-Life 2)