Captain Martin Walker is a fictional character and the protagonist of the video game series Spec Ops. He is a highly skilled soldier and leader of an elite military unit tasked with various missions in conflict zones. Walker is known for his strong sense of duty and commitment to his team, often facing moral dilemmas during his operations. Throughout the series, Walker's character experiences significant psychological challenges as he confronts the harsh realities of war. His journey explores themes of leadership, sacrifice, and the impact of combat on the human psyche, making him a complex figure in the narrative of Spec Ops: The Line.