Barney Calhoun is a fictional character from the video game series Half-Life. He is introduced in the game Half-Life: Blue Shift, where he serves as a security guard at the fictional Black Mesa Research Facility. Barney is known for his friendly demeanor and humorous personality, which contrasts with the game's often tense atmosphere. In the Half-Life universe, Barney plays a crucial role in helping the protagonist, Gordon Freeman, escape from the facility during an alien invasion. His character is notable for providing comic relief and showcasing the human side of the chaos surrounding the events of the game.