Adrian Shephard

Adrian Shephard - Protagonist of Half-Life: Opposing Force. HECU commando stationed at Santego's base in Arizona.

Origins
At the age of 22 he reached the position of corporal at HECU. Along with other commandos, he was stationed at Sante's base, where he underwent rigorous training. Shortly before the Incident, Shepard was mysteriously placed on a priority training list, after which he was trained in using a PVC vest. He was sent with other soldiers on a secret mission to the Black Mesa Research Facility to stabilize the situation after the resonance cascade, by eliminating creatures from Xen and witnesses in the form of Black Mesa personnel, especially Gordon Freeman. During transport to the complex, the helicopter that flew his unit crashed, and Shephard separated from the rest. From then on, he must fight for his own life, supported by other commandos scattered throughout the facility and scientists.

Missing in action
After a few hours of wandering around the Black Mesa and meeting the first Shocktrooper, Adrian finally arrived at the HECU assembly point, where he learned that the army was retreating from the complex, and that everyone was about to go to the helipad. Just before entering the square, however, the door of the tunnel in which Shepard was located is closed by G-Man, cutting off the soldier's exit path. Shepard is forced to go deeper into the labs, hoping to find another way out and capture Gordon Freeman. Along the way, he encounters survivors, other soldiers left behind, and Black Ops agents who have just arrived.

Fighting adversity, Adrian reaches the Lambda complex, where he witnesses Gordon's teleportation to Xen. Then he finds Displacer Cannon.

He was one of the first, and probably the only people who met representatives of Race X, defeated, among others, Pit Worm. Adrian later discovered that Black Ops were planning to blow up Black Mesa with a nuclear warhead. He managed to thwart it, but the bomb was rearmed by G-Man.

Eventually, Shepard finds the Race X portal and defeats the creature that tries to go through it - Gene Worma. The creature returns to its dimension, and just before the explosion of the bomb Adrian is moved by G-Man. He places the corporal in a slow teleport until he is needed again.

Fate
It is not known what happened to Adrian Shepard after the events of Opposing Force, but he is the hero of several Half-Life 2 mods, such as Awakening or Prospekt. Some speculate that Adrian may also appear in Half-Life 3, as Gordon's opponent or ally, Marc Laidlaw even confirmed this possibility.